Linked loci in chromosome 1 (FXIIIB, HF, PEPC) and their variability in Brazilian Indians.

A total of 352 individuals living in seven localities of two Brazilian Indian groups (Macushi and Içana River Indians) were variously studied for coagulation factor XIIIB, human factor H, and a new polymorphism of peptidase C. No significant inter- or intra-tribal differences were found for the FXIIIB alleles, the frequencies varying around 95% for F13B*3 and 5% for F13B*1. Results for HF were heterogeneous, HF*A presenting a much higher frequency among the Macushi (32%) than among the Içana River Indians (9%).