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" ... The authors genotyped 11 markers of the male-specific region of the Y chromosome in 3233 biologically unrelated British men from three cohorts: the British Heart Foundation Family Heart Study (BHF-FHS), West of Scotland Coronary Prevention Study (WOSCOPS), and Cardiogenics Study. On the basis of this information, each Y chromosome was tracked back into one of 13 ancient lineages defined as haplogroups. ... "
" ... To identify these genes, Dr Gazda and her collaborators genotyped 52 canary and siskin gene variants and found 12 variants in the siskin-derived portion of the canary genome, which was around 36-kilobases long. This portion of the genome contained three genes but only one gene matched their criteria: BCO2 (β-carotene oxygenase 2). This gene encodes an enzyme that breaks down carotenoid pigments, and it showed significantly increased expression in some tissues in females compared with the same tissues in males. ... "