Maia V, Hulak A
Cytogenet Cell Genet. 1981;31(2):33-9. doi: 10.1159/000131623.
Eighty-four specimens of Oryzomys subflavus, collected in the State of Pernambuco, Brazil, were studied. A Robertsonian chromosome polymorphism, characterized by a varying diploid number of 50, 49, 48, and 46, was found. All specimens showed a chromosome arm number of 56. G-banding patterns in somatic cells allowed identification of the chromosome pairs (2, 3, 5, and 7) involved in centric fusion. C-banding revealed the presence of constitutive heterochromatin near the centromere the X chromosome and those of the autosomes. The Y chromosome presented a large heterochromatic block in the distal portion of its long arm.
对在巴西伯南布哥州采集的84份黄腹稻鼠标本进行了研究。发现了一种罗伯逊染色体多态性，其特征是二倍体数目变化为50、49、48和46。所有标本的染色体臂数均为56。体细胞中的G带模式有助于识别参与着丝粒融合的染色体对（2、3、5和7）。C带显示在着丝粒附近、X染色体和常染色体存在组成型异染色质。Y染色体在其长臂远端有一个大的异染色质块。
