... and sources of variability of sister-chromatid exchange frequencies in cattle*J CatalánC MorenoMV Arruga1 La6oratory of Cytogenetics;2 Quantitative Genetics Unit, Veterinary ... the totality of individuals analyzed (Di Berardino and Shoffner, 1979; Gutierrez and Calvo,1981; MacFee and Long, 1982; Di Berardino et al, 1983; Margolin and Shelby,1985; ... (1982) Sister-chromatid exchanges in the active and inactiveX chromosomes. Chromosoma 87, 359-362McFee AF, Sherrill MN (1983) Sister-chromatid exchanges induced in swine lym-phocytes...