The progesterone receptor (PR), also known as NR3C3 or nuclear receptor subfamily 3, group C, member 3, is a protein found inside cells. It is activated by the steroid hormone progesterone.
In humans, PR is encoded by a single PGRgene residing on chromosome 11q22,[5][6][7] it has two isoforms, PR-A and PR-B, that differ in their molecular weight.[8][9][10] The PR-B is the positive regulator of the effects of progesterone, while PR-A serve to antagonize the effects of PR-B.[11]
^"Human PubMed Reference:". National Center for Biotechnology Information, U.S. National Library of Medicine.
^"Mouse PubMed Reference:". National Center for Biotechnology Information, U.S. National Library of Medicine.
^Misrahi M, Atger M, d'Auriol L, Loosfelt H, Meriel C, Fridlansky F, et al. (March 1987). "Complete amino acid sequence of the human progesterone receptor deduced from cloned cDNA". Biochemical and Biophysical Research Communications. 143 (2): 740–8. doi:10.1016/0006-291X(87)91416-1. PMID3551956.