Domains within the mammalian ornithine decarboxylase messenger RNA have evolved independently and episodically.

Abstract excerpt

Ornithine decarboxylase (ODC) is the first enzyme in the polyamine biosynthetic pathway. We have studied the evolutionary history of the mammalian ODC mRNA, focusing on the rate of accumulation of sequence divergence within specific subregions of the molecule. The phylogenetic relationships among the mRNAs from several mammalian species, including two mouse species, rat, hamster, and human, were determined based...

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