Table 2.

Comparison of Bw4 and Bw6 frequencies based on the presence of methionine or threonine in second position of HLA-B leader peptides

aa 2^nd position	Caucasians	African Americans	Asian Americans
Met	0.30	0.20	0.18
Thr	0.70	0.80	0.82
Met/Met	0.09	0.04	0.04
Met/Thr	0.42	0.32	0.27
Thr/Thr	0.49	0.64	0.69
*Supertype* *alleles*
Bw6	0.61	0.74	0.55
Bw4	0.39	0.26	0.45
*Supertype* *genotypes*
Bw6/Bw6	0.37	0.55	0.30
Bw4/Bw4	0.15	0.07	0.20
Bw6/Bw4	0.49	0.38	0.50