Table 2.

Affinity of unmodified IgG1 (U) to the different FcγRs.

	Mean affinity	SEM
FcγRI	3.0 × 10−9	±8.7 × 10−10
FcγRIIa131H	3.8 × 10−7	±1.3 × 10−8
FcγRIIa131R	4.8 × 10−7	±2.8 × 10−8
FcγRIIb	2.7 × 10−6	±1.1 × 10−7
FcγRIIIa158F	1.3 × 10−6	±9.5 × 10−8
FcγRIIIa158V	2.4 × 10−7	±1.0 × 10−8
FcγRIIIb NA1	3.2 × 10−6	±4.7 × 10−7
FcγRIIIb NA2	2.8 × 10−6	±1.0 × 10−7

Affinity in K_D, as measured by SPR.