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The X Chromosome carries annotated genes, of which are protein coding. Gene order closely matches that found in primates including humans and carnivores including cats and dogs , which is inferred to be ancestral. Nevertheless, several protein-coding genes present on the human X Chromosome were absent from the pig, and 38 pig-specific X-chromosomal genes were annotated, 22 of which were olfactory receptors. The pig Y-specific Chromosome sequence generated here comprises 30 megabases Mb. A Mb subset of this sequence was assembled, revealing two clusters of male-specific low copy number genes, separated by an ampliconic region including the HSFY gene family, which together make up most of the short arm.
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The pig X and Y Chromosomes: structure, sequence, and evolution

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