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Complementary DNA (cDNA) and genomic DNA, including flanking regions of the prolactin (PRL) gene of domesticated duck, were cloned and sequenced. Duck PRL was found to have 92.0, 91.7, and 91.4% sequence identity at the cDNA level to PRL of chicken, turkey, and quail, respectively. The predicted amino acid sequence had an overall similarity with a comparable region of chicken (93.4%), turkey (91.3%),...