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Are strongly homologous proteins identical in function?

Asked by sandalman (428points) November 12th, 2010

I’ve been having a conversation with a skeptical agnostic, and he imputed that just because the 10 of the 50 proteins in a bacterial flagellum are strongly identical to a type 3 secretory system, it didn’t necessarily mean anything. How true is this, and to what degree?

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