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In the preliminary cytogenetic investigations carried out on 40 cows of the lowland black-and-white breed, in which leukaemia has been diagnosed clinically and post mortem, numerous cases of chromosomal aberration were observed concerning usually somatic chromosomes, although some cases of aberration of sexual chromosomes occurred as well (6). There are many similar reports (3, 4, 5, 7, 8). The aberration...
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