The progesterone receptor B (PR-B) is one of three known isoforms of the progesterone receptor (PR), the main biological target of the endogenous progestogen sex hormone progesterone.[1][2] The other isoforms of the PR include the PR-A and PR-C.[1][2] 
 See also
  References
  
 
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(1) Basic domains  | 
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 | (1.1) Basic leucine zipper (bZIP) |  | 
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 | (1.2) Basic helix-loop-helix (bHLH) | | Group A |  | 
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 | Group B |  | 
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 Group C bHLH-PAS |  | 
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 | Group D |  | 
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 | Group E |  | 
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 Group F bHLH-COE |  | 
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 | (1.3) bHLH-ZIP |  | 
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 | (1.4) NF-1 |  | 
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 | (1.5) RF-X |  | 
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 | (1.6) Basic helix-span-helix (bHSH) |  | 
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(2) Zinc finger DNA-binding domains   | 
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 | (2.1) Nuclear receptor (Cys4) | | subfamily 1 |  | 
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 | subfamily 2 |  | 
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 | subfamily 3 |  | 
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 | subfamily 4 |  | 
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 | subfamily 5 |  | 
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 | subfamily 6 |  | 
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 | subfamily 0 |  | 
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 | (2.2) Other Cys4 |  | 
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 | (2.3) Cys2His2 |  | 
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 | (2.4) Cys6 |  | 
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 | (2.5) Alternating composition |  | 
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 | (2.6) WRKY |  | 
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(4) β-Scaffold factors with minor groove contacts  | 
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 (0) Other transcription factors  | 
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see also transcription factor/coregulator deficiencies  | 
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| PRTooltip Progesterone receptor | | Agonists |      - Testosterone derivatives: Progestins: 6,6-Difluoronorethisterone
  - 6,6-Difluoronorethisterone acetate
  - 17α-Allyl-19-nortestosterone
  - Allylestrenol
  - Altrenogest
  - Chloroethynylnorgestrel
  - Cingestol
  - Danazol
  - Desogestrel
  - Dienogest
  - Ethinylandrostenediol 
  - Ethisterone
  - Ethynerone
  - Etonogestrel
  - Etynodiol
  - Etynodiol diacetate
  - Gestodene
  - Gestrinone
  - Levonorgestrel
  - Levonorgestrel esters (e.g., levonorgestrel butanoate)
  - Lynestrenol
  - Lynestrenol phenylpropionate
  - Metynodiol
  - Metynodiol diacetate
  - Norelgestromin
  - Norethisterone (norethindrone)
  - Norethisterone esters (e.g., norethisterone acetate, norethisterone enanthate)
  - Noretynodrel
  - Norgesterone
  - Norgestimate
  - Norgestrel
  - Norgestrienone
  - Norvinisterone
  - Oxendolone
  - Quingestanol
  - Quingestanol acetate
  - Tibolone
  - Tigestol
  - Tosagestin; Anabolic–androgenic steroids: 11β-Methyl-19-nortestosterone
  - 11β-Methyl-19-nortestosterone dodecylcarbonate
  - 19-Nor-5-androstenediol
  - 19-Nor-5-androstenedione
  - 19-Nordehydroepiandrosterone
  - Bolandiol
  - Bolandiol dipropionate
  - Bolandione
  - Dimethisterone
  - Dienedione
  - Dienolone
  - Dimethandrolone
  - Dimethandrolone buciclate
  - Dimethandrolone dodecylcarbonate
  - Dimethandrolone undecanoate
  - Dimethyldienolone
  - Dimethyltrienolone
  - Ethyldienolone
  - Ethylestrenol (ethylnandrol)
  - Methyldienolone
  - Metribolone (R-1881)
  - Methoxydienone (methoxygonadiene)
  - Mibolerone
  - Nandrolone
  - Nandrolone esters (e.g., nandrolone decanoate, nandrolone phenylpropionate)
  - Norethandrolone
  - Normethandrone (methylestrenolone, normethandrolone, normethisterone)
  - RU-2309
  - Tetrahydrogestrinone
  - Trenbolone (trienolone)
  - Trenbolone esters (e.g., trenbolone acetate, trenbolone enanthate)
  - Trendione
  - Trestolone
  - Trestolone acetate
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 Mixed (SPRMsTooltip Selective progesterone receptor modulators) |  | 
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 | Antagonists |  | 
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mPRTooltip Membrane progesterone receptor (PAQRTooltip Progestin and adipoQ receptor) |  | 
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 - See also
  - Receptor/signaling modulators
  - Progestogens and antiprogestogens
  - Androgen receptor modulators
  - Estrogen receptor modulators
  - List of progestogens
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