FcγRIIIa transcript expression on NK cells for 13 donors. Transcript expression was assayed by real-time RT-PCR analysis (A), and cell surface CD16 expression by quantitative flow cytometry (B), on NK cells for donors whose genotyping demonstrated FcγRIIIa-158 V/V (n = 4), V/F (n = 4), and F/F (n = 5). P is less than .001 for transcript levels for individuals with FcγRIIIa-158 V/V versus V/F or F/F genotype. P equals .029 for CD16 expression for individuals expressing at least one valine at FcγRIIIa-158 versus F/F. Values represent means plus or minus SE.