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September 1, 2015

Homework Help: Evolutionary Science (stem-lineage?)

Posted by Lena on Tuesday, March 15, 2011 at 8:06pm.

I'm reading this article and it says the following:
"the PRL regulatory gene HoxA-11 experienced a period of strong positive selection in the stem-lineage of eutharian mammals"

What does this mean? I'm not to sure what they mean when they're referring to stem-lineage.

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