Four esterase D (ESD) phenotypes, presumably resulting from the segregation of three alleles with moderate polymorphic frequencies, were observed in a sample of the black handed tamarin, Saguinus midas niger, from the northern Amazonian region (Brazil). Previous surveys in the non-human Anthropoidea indicate that the ESD locus is polymorphic in at least 4 of the 19 taxonomic entities listed.
Keywords: Callithrichidae; black handed tamarins; polymorphism.
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