Table 1.

CD28 dAb affinity and kinetic parameters

 Receptor ka (1/Ms) kd (1/s) Kd (nM) Rmax 
CD28 dAb Mouse CD28 8.4 ± 6.4 × 104 2.2 ± 1.6 × 10−5 2.6 ± 2.8 5.9 ± 0.3 
CD28 dAb Human CD28 N.D. N.D. N.D. 
 Receptor ka (1/Ms) kd (1/s) Kd (nM) Rmax 
CD28 dAb Mouse CD28 8.4 ± 6.4 × 104 2.2 ± 1.6 × 10−5 2.6 ± 2.8 5.9 ± 0.3 
CD28 dAb Human CD28 N.D. N.D. N.D. 

N.D., none detected; Rmax = Biacore maximum response signal.

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