Japanese Journal of Veterinary Research;Volume 15, Number 2

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CHROMOSOME STUDIES ON HETEROSEXUAL TWINS IN CATTLE : IV LONG-TERM OBSERVATIONS OF SEX-CHROMOSOME CHIMERA RATIO IN CULTURED LEUKOCYTES

KANAGAWA, Hiroshi;KAWATA, Keiichiro;ISHIKAWA, Tsune;INOUE, Tadahiro

Permalink : http://hdl.handle.net/2115/1864
JaLCDOI : 10.14943/jjvr.15.2.31

Abstract

Sex-chromosome chimera ratio in cultured leukocytes was examined regularly during 1~15 months after birth on 7 heterosexual twins involving the freemartin. All freemartins and male co-twins showed 2A-XX/2A-XY chimerism. The chimera ratio varied in each animal, but between co-twined pairs, the difference of the ratio was insignificant. In addition, no significant difference was detected in the chimera ratio in each individual throughout the observation periods (1~15 months). This suggests that the sex-chromosome chimerism may be of an invariable nature for life.

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