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supernumerary chromosomes in the black rat (rattus rattus) and their distribution in three geographic variants.supernumerary chromosomes have been examined in 352 black rats, covering three geographic variants, by use of conventional and c-band staining techniques. metacentric supernumerary chromosomes, one to three in number, were found in malayan black rats (rattus rattus diardii), with 2n=42, in indian black rats (r. rattus rufescens), with 2n=38, and in ceylonese black rats (r. rattus kandianus), with 2n=40. the supernumeraries had similar morphology and stained heavily along their entire length by c ...1977862437
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