“…The true sex chromatin should then be formed by the short arm of one of the X:s but be included in a large chromocenter formed by the entire X as in the field-vole (HANSEN-MELANDER 1965). Also it is difficult to distinguish a sex chromatin in adults of the Syrian hamster because most of their somatic cells contain several large chromocenters of which one should be the sex chromatin (WALSH 1955;KLINGER 1958;MILES and KWNS 1960;MOORE 1962MOORE , 1965MOORE , 1966NAYYAR and BARR 1966).…”