Transient expression of human and chicken progesterone receptors does not support alternative translational initiation from a single mRNA as the mechanism generating two receptor isoforms.

Abstract excerpt

Two isoforms (A and B) of the human (hPR) and chicken (cPR) progesterone receptors originate from a single PR gene. cPR form A results from initiation of translation at a downstream ATG codon (ATG2) which in the cPR cDNA-deduced open reading frame is found 128 amino acids C-terminal to and in-frame with the first ATG codon (ATG1) that gives rise to form B. Our recent observation of an abundant cPR mRNA which...

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