Proceedings of the National Academy of Sciences of the United States of America, Vol. 99, No. 1 (Jan. 8, 2002), pp. 268-273 (6 pages) Sequence evolution of the reverse transcriptase (RT) gene in ...
700 million years ago, a remarkable creature emerged for the first time. Though it may not have been much to look at by today’s standards, the animal had a front and a back, a top and a bottom. This ...
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