United States population data on the multiplex short tandem repeat loci--HUMTHO1, TPOX, and CSF1PO--and the variable number tandem repeat locus D1S80.

Allele frequencies for three tetrameric short tandem repeat (STR) loci HUMTHO1, TPOX, and CSF1PO and a variable number tandem repeat locus D1S80 were determined in United States Caucasian, African American, and Hispanic sample populations. All loci, except the TPOX locus in the Caucasian sample population, meet Hardy-Weinberg expectations. There is no evidence for association of alleles among the four loci. The allelic frequency data are similar to other comparable data within the same major population group.