Yonenaga-Yassuda, YatiyoDe Fátima Lima De Assis, MariaKasahara, Sanae [UNESP]2022-04-282022-04-281992-01-01Caryologia, v. 45, n. 2, p. 163-174, 1992.2165-53910008-7114http://hdl.handle.net/11449/223834The distribution of Ag-NORs was analyzed in 25 specimens of Akodon aff. arviculoides (2n = 24 and 25). NORs occurred on chromosome arms 2q, 3p, 6p, 7q and lOq, as identified by successive Ag- and G-band staining. In one specimen with 2n = 25, the supernumerary B chromosome presented Ag-NORs on both arms but in 3 other animals this chromosome was never stained. The number of Ag-NORs per cell ranged from 1 to 10 and the staining pattern was characteristic for each chromosome pair in an individual. No differences between tissues were observed in four animals investigated. © 1992 Taylor & Francis Group, LLC.163-174engArtigo10.1080/00087114.1992.107972202-s2.0-0001420976