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A population living in the border of Brazil and Surinam was studied with regard to 21 genetic markers from 13 independent systems. No marked heterogeneity was observed among this group and two others from the same tribe investigated by other researchers. The frequencies of genes LMs, Fya and Hpx are in the upper third of the distribution range observed among South American Indians; those for Rx and Rz are in the middle, while LMS, LNS, LNs, R-, Dia, and especially P1 and Gc- present low values. All indi­viduals were apparently homozygous for genes k, Tfv, HbA, A/A, and lacked Wr11. Some evidence was obtained of limited admixture but for the most part this population appears to retain an unmodified Amerindian gene pool.