| BSFAB-101 |
Recombinant Anti-CD3 x Anti-PSCA Bispecific Antibody (Tandem Fab) |
Human |
Tandem Fab |
CD3 |
Mouse |
PSCA |
Mouse |
Inquiry |
| BSFAB-100 |
Recombinant Anti-CD3 x Anti-PSA Bispecific Antibody (Tandem Fab) |
Human |
Tandem Fab |
CD3 |
Mouse |
PSA |
Mouse |
Inquiry |
| BSFAB-099 |
Recombinant Anti-CD3 x Anti-PLAP Bispecific Antibody (Tandem Fab) |
Human |
Tandem Fab |
CD3 |
Mouse |
PLAP |
Mouse |
Inquiry |
| BSFAB-098 |
Recombinant Anti-CD3 x Anti-PD1 Bispecific Antibody (Tandem Fab) |
Human |
Tandem Fab |
CD3 |
Mouse |
PD1 |
Mouse |
Inquiry |
| BSFAB-097 |
Recombinant Anti-CD3 x Anti-p97 Bispecific Antibody (Tandem Fab) |
Human |
Tandem Fab |
CD3 |
Mouse |
p97 |
Mouse |
Inquiry |
| BSFAB-096 |
Recombinant Anti-CD3 x Anti-P cadherin Bispecific Antibody (Tandem Fab) |
Human |
Tandem Fab |
CD3 |
Mouse |
P-Cadherin |
Mouse |
Inquiry |
| BSFAB-095 |
Recombinant Anti-CD3 x Anti-MUC1 Bispecific Antibody (Tandem Fab) |
Human |
Tandem Fab |
CD3 |
Mouse |
MUC1 |
Mouse |
Inquiry |
| BSFAB-094 |
Recombinant Anti-CD3 x Anti-CSPG4 Bispecific Antibody (Tandem Fab) |
Human |
Tandem Fab |
CD3 |
Mouse |
CSPG4 |
Mouse |
Inquiry |
| BSFAB-093 |
Recombinant Anti-CD3 x Anti-IL2R Bispecific Antibody (Tandem Fab) |
Human |
Tandem Fab |
CD3 |
Mouse |
IL2R |
Mouse |
Inquiry |
| BSFAB-092 |
Recombinant Anti-CD3 x Anti-IGF1R Bispecific Antibody (Tandem Fab) |
Human |
Tandem Fab |
CD3 |
Mouse |
IGF1R |
Mouse |
Inquiry |
| BSFAB-091 |
Recombinant Anti-CD3 x Anti-HN Bispecific Antibody (Tandem Fab) |
Human |
Tandem Fab |
CD3 |
Mouse |
HN |
Mouse |
Inquiry |
| BSFAB-090 |
Recombinant Anti-CD3 x Anti-HER2 Bispecific Antibody (Tandem Fab) |
Human |
Tandem Fab |
CD3 |
Mouse |
HER2 |
Mouse |
Inquiry |
| BSFAB-089 |
Recombinant Anti-CD3 x Anti-HBVgp3 Bispecific Antibody (Tandem Fab) |
Human |
Tandem Fab |
CD3 |
Mouse |
HBVgp3 |
Mouse |
Inquiry |
| BSFAB-088 |
Recombinant Anti-CD3 x Anti-GPNMB Bispecific Antibody (Tandem Fab) |
Human |
Tandem Fab |
CD3 |
Mouse |
GPNMB |
Mouse |
Inquiry |
| BSFAB-087 |
Recombinant Anti-CD3 x Anti-GPC3 Bispecific Antibody (Tandem Fab) |
Human |
Tandem Fab |
CD3 |
Mouse |
GPC3 |
Mouse |
Inquiry |
| BSFAB-086 |
Recombinant Anti-CD3 x Anti-gpA33 Bispecific Antibody (Tandem Fab) |
Human |
Tandem Fab |
CD3 |
Mouse |
gpA33 |
Mouse |
Inquiry |
| BSFAB-085 |
Recombinant Anti-CD3 x Anti-HIV-1 gp41 Bispecific Antibody (Tandem Fab) |
Human |
Tandem Fab |
CD3 |
Mouse |
HIV-1 gp41 |
Mouse |
Inquiry |
| BSFAB-084 |
Recombinant Anti-CD3 x Anti-HIV-1 gp120 Bispecific Antibody (Tandem Fab) |
Human |
Tandem Fab |
CD3 |
Mouse |
HIV-1 gp120 |
Mouse |
Inquiry |
| BSFAB-083 |
Recombinant Anti-CD3 x Anti-GD2 Bispecific Antibody (Tandem Fab) |
Human |
Tandem Fab |
CD3 |
Mouse |
GD2 |
Mouse |
Inquiry |
| BSFAB-082 |
Recombinant Anti-CD3 x Anti-FOLR1 Bispecific Antibody (Tandem Fab) |
Human |
Tandem Fab |
CD3 |
Mouse |
FOLR1 |
Mouse |
Inquiry |
| BSFAB-081 |
Recombinant Anti-CD3 x Anti-FcRH5 Bispecific Antibody (Tandem Fab) |
Human |
Tandem Fab |
CD3 |
Mouse |
FcRH5 |
Mouse |
Inquiry |
| BSFAB-080 |
Recombinant Anti-CD3 x Anti-FAP Bispecific Antibody (Tandem Fab) |
Human |
Tandem Fab |
CD3 |
Mouse |
FAP |
Mouse |
Inquiry |
| BSFAB-079 |
Recombinant Anti-CD3 x Anti-EPCAM Bispecific Antibody (Tandem Fab) |
Human |
Tandem Fab |
CD3 |
Mouse |
EPCAM |
Mouse |
Inquiry |
| BSFAB-078 |
Recombinant Anti-CD3 x Anti-CD248 Bispecific Antibody (Tandem Fab) |
Human |
Tandem Fab |
CD3 |
Mouse |
CD248 |
Mouse |
Inquiry |
| BSFAB-077 |
Recombinant Anti-CD3 x Anti-EGFR Bispecific Antibody (Tandem Fab) |
Human |
Tandem Fab |
CD3 |
Mouse |
EGFR |
Mouse |
Inquiry |
| BSFAB-076 |
Recombinant Anti-CD3 x Anti-DLL3 Bispecific Antibody (Tandem Fab) |
Human |
Tandem Fab |
CD3 |
Mouse |
DLL3 |
Mouse |
Inquiry |
| BSFAB-075 |
Recombinant Anti-CD3 x Anti-CXCR5 Bispecific Antibody (Tandem Fab) |
Human |
Tandem Fab |
CD3 |
Mouse |
CXCR5 |
Mouse |
Inquiry |
| BSFAB-074 |
Recombinant Anti-CD3 x Anti-MET Bispecific Antibody (Tandem Fab) |
Human |
Tandem Fab |
CD3 |
Mouse |
MET |
Mouse |
Inquiry |
| BSFAB-073 |
Recombinant Anti-CD3 x Anti-CLEC12A Bispecific Antibody (Tandem Fab) |
Human |
Tandem Fab |
CD3 |
Mouse |
CLEC12A |
Mouse |
Inquiry |
| BSFAB-072 |
Recombinant Anti-CD3 x Anti-CEA Bispecific Antibody (Tandem Fab) |
Human |
Tandem Fab |
CD3 |
Mouse |
CEA |
Mouse |
Inquiry |
| BSFAB-071 |
Recombinant Anti-CD3 x Anti-CD8 Bispecific Antibody (Tandem Fab) |
Human |
Tandem Fab |
CD3 |
Mouse |
CD8 |
Mouse |
Inquiry |
| BSFAB-070 |
Recombinant Anti-CD3 x Anti-CD79B Bispecific Antibody (Tandem Fab) |
Human |
Tandem Fab |
CD3 |
Mouse |
CD79B |
Mouse |
Inquiry |
| BSFAB-069 |
Recombinant Anti-CD3 x Anti-CD74 Bispecific Antibody (Tandem Fab) |
Human |
Tandem Fab |
CD3 |
Mouse |
CD74 |
Mouse |
Inquiry |
| BSFAB-068 |
Recombinant Anti-CD3 x Anti-CD44 Bispecific Antibody (Tandem Fab) |
Human |
Tandem Fab |
CD3 |
Mouse |
CD44 |
Mouse |
Inquiry |
| BSFAB-067 |
Recombinant Anti-CD3 x Anti-CD4 Bispecific Antibody (Tandem Fab) |
Human |
Tandem Fab |
CD3 |
Mouse |
CD4 |
Mouse |
Inquiry |
| BSFAB-066 |
Recombinant Anti-CD3 x Anti-CD33 Bispecific Antibody (Tandem Fab) |
Human |
Tandem Fab |
CD3 |
Mouse |
CD33 |
Mouse |
Inquiry |
| BSFAB-065 |
Recombinant Anti-CD3 x Anti-CD30 Bispecific Antibody (Tandem Fab) |
Human |
Tandem Fab |
CD3 |
Mouse |
CD30 |
Mouse |
Inquiry |
| BSFAB-064 |
Recombinant Anti-CD3 x Anti-B7H3 Bispecific Antibody (Tandem Fab) |
Human |
Tandem Fab |
CD3 |
Mouse |
B7H3 |
Mouse |
Inquiry |
| BSFAB-063 |
Recombinant Anti-CD28 x Anti-CSPG4 Bispecific Antibody (Tandem Fab) |
Human |
Tandem Fab |
CD28 |
Mouse |
CSPG4 |
Mouse |
Inquiry |
| BSFAB-062 |
Recombinant Anti-CD28 x Anti-MUC1 Bispecific Antibody (Tandem Fab) |
Human |
Tandem Fab |
CD28 |
Mouse |
MUC1 |
Mouse |
Inquiry |
| BSFAB-061 |
Recombinant Anti-CD28 x Anti-HN Bispecific Antibody (Tandem Fab) |
Human |
Tandem Fab |
CD28 |
Mouse |
HN |
Mouse |
Inquiry |
| BSFAB-060 |
Recombinant Anti-CD28 x Anti-FOLR1 Bispecific Antibody (Tandem Fab) |
Human |
Tandem Fab |
CD28 |
Mouse |
FOLR1 |
Mouse |
Inquiry |
| BSFAB-059 |
Recombinant Anti-CD28 x Anti-EPCAM Bispecific Antibody (Tandem Fab) |
Human |
Tandem Fab |
CD28 |
Mouse |
EPCAM |
Mouse |
Inquiry |
| BSFAB-058 |
Recombinant Anti-CD28 x Anti-EGFR Bispecific Antibody (Tandem Fab) |
Human |
Tandem Fab |
CD28 |
Mouse |
EGFR |
Mouse |
Inquiry |
| BSFAB-057 |
Recombinant Anti-CD28 x Anti-CD44 Bispecific Antibody (Tandem Fab) |
Human |
Tandem Fab |
CD28 |
Mouse |
CD44 |
Mouse |
Inquiry |
| BSFAB-056 |
Recombinant Anti-CD28 x Anti-CD40 Bispecific Antibody (Tandem Fab) |
Human |
Tandem Fab |
CD28 |
Mouse |
CD40 |
Mouse |
Inquiry |
| BSFAB-055 |
Recombinant Anti-CD28 x Anti-CD30 Bispecific Antibody (Tandem Fab) |
Human |
Tandem Fab |
CD28 |
Mouse |
CD30 |
Mouse |
Inquiry |
| BSFAB-054 |
Recombinant Anti-CD28 x Anti-CD3 Bispecific Antibody (Tandem Fab) |
Human |
Tandem Fab |
CD28 |
Mouse |
CD3 |
Mouse |
Inquiry |
| BSFAB-053 |
Recombinant Anti-CD22 x Anti-Saporin Bispecific Antibody (Tandem Fab) |
Human |
Tandem Fab |
CD22 |
Mouse |
Saporin |
Mouse |
Inquiry |
| BSFAB-052 |
Recombinant Anti-CD20 x Anti-CD47 Bispecific Antibody (Tandem Fab) |
Human |
Tandem Fab |
CD20 |
Mouse |
CD47 |
Mouse |
Inquiry |
| BSFAB-051 |
Recombinant Anti-CD20 x Anti-CD3 Bispecific Antibody (Tandem Fab) |
Human |
Tandem Fab |
CD20 |
Mouse |
CD3 |
Mouse |
Inquiry |
| BSFAB-050 |
Recombinant Anti-CD20 x Anti-CD28 Bispecific Antibody (Tandem Fab) |
Human |
Tandem Fab |
CD20 |
Mouse |
CD28 |
Mouse |
Inquiry |
| BSFAB-049 |
Recombinant Anti-CD20 x Anti-CD22 Bispecific Antibody (Tandem Fab) |
Human |
Tandem Fab |
CD20 |
Mouse |
CD22 |
Mouse |
Inquiry |
| BSFAB-048 |
Recombinant Anti-CD2 x Anti-TCR (Vβ8) Bispecific Antibody (Tandem Fab) |
Mouse |
Tandem Fab |
CD2 |
Mouse |
TCR (Vβ8) |
Mouse |
Inquiry |
| BSFAB-047 |
Recombinant Anti-CD2 x Anti-MUC1 Bispecific Antibody (Tandem Fab) |
Human |
Tandem Fab |
CD2 |
Mouse |
MUC1 |
Mouse |
Inquiry |
| BSFAB-046 |
Recombinant Anti-CD2 x Anti-EGFR Bispecific Antibody (Tandem Fab) |
Human |
Tandem Fab |
CD2 |
Mouse |
EGFR |
Mouse |
Inquiry |
| BSFAB-045 |
Recombinant Anti-CD19 x Anti-CD89 Bispecific Antibody (Tandem Fab) |
Human |
Tandem Fab |
CD19 |
Mouse |
CD89 |
Mouse |
Inquiry |
| BSFAB-044 |
Recombinant Anti-CD19 x Anti-CD64 Bispecific Antibody (Tandem Fab) |
Human |
Tandem Fab |
CD19 |
Mouse |
CD64 |
Mouse |
Inquiry |
| BSFAB-043 |
Recombinant Anti-CD19 x Anti-CD59 Bispecific Antibody (Tandem Fab) |
Human |
Tandem Fab |
CD19 |
Mouse |
CD59 |
Mouse |
Inquiry |
| BSFAB-042 |
Recombinant Anti-CD19 x Anti-CD47 Bispecific Antibody (Tandem Fab) |
Human |
Tandem Fab |
CD19 |
Mouse |
CD47 |
Mouse |
Inquiry |
| BSFAB-041 |
Recombinant Anti-CD19 x Anti-CD3 Bispecific Antibody (Tandem Fab) |
Human |
Tandem Fab |
CD19 |
Mouse |
CD3 |
Mouse |
Inquiry |
| BSFAB-040 |
Recombinant Anti-CD19 x Anti-CD28 Bispecific Antibody (Tandem Fab) |
Human |
Tandem Fab |
CD19 |
Mouse |
CD28 |
Mouse |
Inquiry |
| BSFAB-039 |
Recombinant Anti-CD19 x Anti-CD22 Bispecific Antibody (Tandem Fab) |
Human |
Tandem Fab |
CD19 |
Mouse |
CD22 |
Mouse |
Inquiry |
| BSFAB-038 |
Recombinant Anti-CD16 x Anti-HER2 Bispecific Antibody (Tandem Fab) |
Human |
Tandem Fab |
CD16 |
Mouse |
HER2 |
Mouse |
Inquiry |
| BSFAB-037 |
Recombinant Anti-CD16 x Anti-GD2 Bispecific Antibody (Tandem Fab) |
Human |
Tandem Fab |
CD16 |
Mouse |
GD2 |
Mouse |
Inquiry |
| BSFAB-036 |
Recombinant Anti-CD16 x Anti-EGFR Bispecific Antibody (Tandem Fab) |
Human |
Tandem Fab |
CD16 |
Mouse |
EGFR |
Mouse |
Inquiry |
| BSFAB-035 |
Recombinant Anti-CD16 x Anti-CD32B Bispecific Antibody (Tandem Fab) |
Human |
Tandem Fab |
CD16 |
Mouse |
CD32B |
Mouse |
Inquiry |
| BSFAB-034 |
Recombinant Anti-CD16 x Anti-CD30 Bispecific Antibody (Tandem Fab) |
Human |
Tandem Fab |
CD16 |
Mouse |
CD30 |
Mouse |
Inquiry |
| BSFAB-033 |
Recombinant Anti-CD15 x Anti-DENV Bispecific Antibody (Tandem Fab) |
Human |
Tandem Fab |
CD15 |
Mouse |
DENV |
Mouse |
Inquiry |
| BSFAB-032 |
Recombinant Anti-CD15 x Anti-CD64 Bispecific Antibody (Tandem Fab) |
Human |
Tandem Fab |
CD15 |
Mouse |
CD64 |
Mouse |
Inquiry |
| BSFAB-031 |
Recombinant Anti-CD133 x Anti-EGFR Bispecific Antibody (Tandem Fab) |
Human |
Tandem Fab |
CD133 |
Mouse |
EGFR |
Mouse |
Inquiry |
| BSFAB-030 |
Recombinant Anti-CD123 x Anti-CD3 Bispecific Antibody (Tandem Fab) |
Human |
Tandem Fab |
CD123 |
Mouse |
CD3 |
Mouse |
Inquiry |
| BSFAB-029 |
Recombinant Anti-CCR5 x Anti-CD3 Bispecific Antibody (Tandem Fab) |
Human |
Tandem Fab |
CCR5 |
Mouse |
CD3 |
Mouse |
Inquiry |
| BSFAB-028 |
Recombinant Anti-CCR3 x Anti-CD300 Bispecific Antibody (Tandem Fab) |
Human |
Tandem Fab |
CCR3 |
Mouse |
CD300 |
Mouse |
Inquiry |
| BSFAB-027 |
Recombinant Anti-CA72-4 x Anti-CD3 Bispecific Antibody (Tandem Fab) |
Human |
Tandem Fab |
CA72-4 |
Mouse |
CD3 |
Mouse |
Inquiry |
| BSFAB-026 |
Recombinant Anti-CA19-9 x Anti-CD3 Bispecific Antibody (Tandem Fab) |
Human |
Tandem Fab |
CA19-9 |
Mouse |
CD3 |
Mouse |
Inquiry |
| BSFAB-024 |
Recombinant Anti-C5 x Anti-HRP Bispecific Antibody (Tandem Fab) |
Human |
Tandem Fab |
C5 |
Mouse |
HRP |
Mouse |
Inquiry |
| BSFAB-023 |
Recombinant Anti-C. albicans x Anti-CD64 Bispecific Antibody (Tandem Fab) |
Human |
Tandem Fab |
C. albicans |
Mouse |
CD64 |
Mouse |
Inquiry |
| BSFAB-022 |
Recombinant Anti-Biotin x Anti-HRP Bispecific Antibody (Tandem Fab) |
|
Tandem Fab |
Biotin |
Mouse |
HRP |
Mouse |
Inquiry |
| BSFAB-021 |
Recombinant Anti-BCMA x Anti-TACI Bispecific Antibody (Tandem Fab) |
Human |
Tandem Fab |
BCMA |
Mouse |
TACI |
Mouse |
Inquiry |
| BSFAB-020 |
Recombinant Anti-BCMA x Anti-CD3 Bispecific Antibody (Tandem Fab) |
Human |
Tandem Fab |
BCMA |
Mouse |
CD3 |
Mouse |
Inquiry |
| BSFAB-019 |
Recombinant Anti-BAFF x Anti-IL17 Bispecific Antibody (Tandem Fab) |
Human |
Tandem Fab |
BAFF |
Mouse |
IL17 |
Mouse |
Inquiry |
| BSFAB-018 |
Recombinant Anti-BAFF x Anti-B7RP1 Bispecific Antibody (Tandem Fab) |
Human |
Tandem Fab |
BAFF |
Mouse |
B7RP1 |
Mouse |
Inquiry |
| BSFAB-017 |
Recombinant Anti-B7H6 x Anti-CD3 Bispecific Antibody (Tandem Fab) |
Human |
Tandem Fab |
B7H6 |
Mouse |
CD3 |
Mouse |
Inquiry |
| BSFAB-016 |
Recombinant Anti-B Cell Lymphoma BCL1 Idiotype x Anti-CD3 Bispecific Antibody (Tandem Fab) |
Mouse |
Tandem Fab |
B Cell Lymphoma BCL1 Idiotype |
Rat |
CD3 |
Mouse |
Inquiry |
| BSFAB-015 |
Recombinant Anti-B Cell Lymphoma A20-HL Idiotype x Anti-CD3 Bispecific Antibody (Tandem Fab) |
Mouse |
Tandem Fab |
B Cell Lymphoma A20-HL Idiotype |
Rat |
CD3 |
Mouse |
Inquiry |
| BSFAB-014 |
Recombinant Anti-B Cell Lymphoma 38C13 Idiotype x Anti-LFA-1 Bispecific Antibody (Tandem Fab) |
Mouse |
Tandem Fab |
B Cell Lymphoma 38C13 Idiotype |
Rat |
LFA-1 |
Mouse |
Inquiry |
| BSFAB-013 |
Recombinant Anti-B Cell Lymphoma 38C13 Idiotype x Anti-CD44 Bispecific Antibody (Tandem Fab) |
Mouse |
Tandem Fab |
B Cell Lymphoma 38C13 Idiotype |
Rat |
CD44 |
Rat |
Inquiry |
| BSFAB-012 |
Recombinant Anti-AR x Anti-DNA Bispecific Antibody (Tandem Fab) |
Human |
Tandem Fab |
AR |
Mouse |
DNA |
Mouse |
Inquiry |
| BSFAB-011 |
Recombinant Anti-AP (Alkaline Phosphatase) x Anti-LPA Bispecific Antibody (Tandem Fab) |
Human |
Tandem Fab |
AP (Alkaline Phosphatase) |
Mouse |
LPA |
Mouse |
Inquiry |
| BSFAB-010 |
Recombinant Anti-AP (Alkaline Phosphatase) x Anti-CEA Bispecific Antibody (Tandem Fab) |
Human |
Tandem Fab |
AP (Alkaline Phosphatase) |
Mouse |
CEA |
Mouse |
Inquiry |
| BSFAB-009 |
Recombinant Anti-AP (Alkaline Phosphatase) x Anti-7-OHC (7-hydroxycoumarin) Bispecific Antibody (Tandem Fab) |
Human |
Tandem Fab |
AP (Alkaline Phosphatase) |
Mouse |
7-OHC (7-hydroxycoumarin) |
Mouse |
Inquiry |
| BSFAB-008 |
Recombinant Anti-Ang2 x Anti-VEGFA Bispecific Antibody (Tandem Fab) |
Human |
Tandem Fab |
Ang2 |
Mouse |
VEGFA |
Mouse |
Inquiry |
| BSFAB-007 |
Recombinant Anti-Albumin x Anti-TNF Bispecific Antibody (Tandem Fab) |
Human |
Tandem Fab |
Albumin |
Mouse |
TNF |
Mouse |
Inquiry |
| BSFAB-006 |
Recombinant Anti-Albumin x Anti-IL-6R Bispecific Antibody (Tandem Fab) |
Human |
Tandem Fab |
Albumin |
Mouse |
IL-6R |
Mouse |
Inquiry |
| BSFAB-005 |
Recombinant Anti-Ad Fiber Knob x Anti-ITGAV Bispecific Antibody (Tandem Fab) |
Human |
Tandem Fab |
Ad Fiber Knob |
Mouse |
ITGAV |
Mouse |
Inquiry |
| BSFAB-004 |
Recombinant Anti-Ad Fiber Knob x Anti-EPCAM Bispecific Antibody (Tandem Fab) |
Human |
Tandem Fab |
Ad Fiber Knob |
Mouse |
EPCAM |
Mouse |
Inquiry |
| BSFAB-003 |
Recombinant Anti-Ad Fiber Knob x Anti-CEA Bispecific Antibody (Tandem Fab) |
Human |
Tandem Fab |
Ad Fiber Knob |
Mouse |
CEA |
Mouse |
Inquiry |
| BSFAB-002 |
Recombinant Anti-Ad Fiber Knob x Anti-CD40 Bispecific Antibody (Tandem Fab) |
Human |
Tandem Fab |
Ad Fiber Knob |
Mouse |
CD40 |
Mouse |
Inquiry |
| BSFAB-001 |
Recombinant Anti-B Cell Lymphoma BCL1 Idiotype x Anti-CD64 Bispecific Antibody (Tandem Fab) |
Mouse |
Tandem Fab |
B Cell Lymphoma BCL1 Idiotype |
Rat |
CD64 |
Mouse |
Inquiry |
Tandem Fabs are a class of Fab-based bispecific antibody fragments. Just as its name implies, tandem Fab comprises two Fabs targeting different epitopes. Usually, Fab is more thermally stable than the corresponding scFv. Usually it is expressed as a 3-chain construct and has a His-tag for affinity purification. The two Fd regions are connected by a flexible linker. Tandem Fab is bispecific and has monovalent for each antigen specificity (1+1 antigen-binding valency).
