“…HSA 1/10 was not present in the Cavia karyotype. Finally, we conclude that the putative ancestral karyotype of Anomaluromorpha, Hystricomorpha, Myomorpha and Castorimorpha had a 2n¼60 (or 2n¼62 if the HSA 1/10 association in myomorphs and sciuromorphs is convergent) that consisted of HSA 1, 1/7, 1/10, 2, 2, 3, 3/19, 3/21, 4, 4, 4/8, 5, 5, 6, 6, 7, 8, 9/11, 10/16, 11, 12/22 (twice), 13, 14/15, 15, 16/ 19, 17, 18, 20, X and Y. The following rearrangements offer a striking confirmation of the close evolutionary relationship of Myomorpha and Castorimorpha: HSA 5/17 (it is absent in Mus and Rattus, but present in Sicista), HSA 11/15 and fission of HSA 14/15 (Graphodatsky et al, 2008). However, the use of different methods of analysis (DNA sequences for myomorph genomes and chromosome painting for castorimorphs) could give inconsistent results because of resolution differences of the analyses.…”