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本帖最后由 细胞海洋 于 2013-4-19 08:58 编辑
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An African coelacanth and diver photographed by Laurent Ballesta in Sodwana Bay, South Africa. The African coelacanth (Latimeria chalumnae) attracted international attention when a specimen was netted off the South African coast in 1938, as coelacanths were thought to have gone extinct 70 million years ago. Now its genome has been sequenced. Phylogenomic analysis resolves the long-standing question of which lobe-finned fish is the closest living relative of the land vertebrates — it is the lungfish, and not the coelacanth. The protein-coding genes of the coelacanth are slowly evolving, which perhaps explains how similar today’s coelacanth looks to its 300-million-year-old fossil ancestors. Examination of changes in genes and regulatory elements shows the importance of factors including brain and fin development, immunity and nitrogen excretion in the adaptation of vertebrates to land. 4 R- ]& @. x$ X6 {$ m- a) A
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发表于 2013-4-18 13:24
