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Science 3 June 1960:
Vol. 131. no. 3414, pp. 1672 - 1673
DOI: 10.1126/science.131.3414.1672
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Articles

Chromosome Number of the Chimpanzee, Pan troglodytes

William J. Young 1, Timothy Merz 1, Malcolm A. Ferguson-Smith 1, and Alan W. Johnston 1

1 Departments of Anatomy and Biology, and Division of Medical Genetics, Johns Hopkins University, Baltimore, Maryland

The chromosome numbers of nine chimpanzees (Pani troglodytes) have been determined by the bone marrow technique. The diploid number in this species is 48, with a probable XX-XY sex chromosome constitution.

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Science. ISSN 0036-8075 (print), 1095-9203 (online)