Anti-Progesterone receptor antibodies are directed against the protein encoded by the gene PGR in humans. The Progesterone receptor protein has an expected mass of 99 kDa, but there are 5 reported isoforms. The protein may also be known as NR3C3, PG, and nuclear receptor subfamily 3 group C member 3. Variants of this antigen may also be found in other species, including canine, porcine, monkey, mouse and rat. The Progesterone receptor antigen is a documented cancer marker.
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