The origin and evolution of lactation
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Journal of Biology 2009, 8:37 doi:10.1186/jbiol139Published: 24 April 2009
The presence of mammary glands is the defining morphological feature of mammals. The recent assembly of the bovine genome and a report in Genome Biology that links the milk and lactation data of bovine and other mammalian genomes will help biologists investigate this economically and medically important feature.