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Table 2 Summary of PR isoform expression patterns

From: The cytoplasmic 60 kDa progesterone receptor isoform predominates in the human amniochorion and placenta at term

Tissue PR-B1,2,3 PR-A1,3 60 kDa1,* PR-S2 PR-M3
Amnion - - +++ - -
Chorionic cytotrophoblast - - +++ - N/D
Placental cytotrophoblast - - - - N/D
Placental syncytiotrophoblast - - + - N/D
Maternal decidua ++ +++ ++ + -
  1. Presence determined by 1Immunohistochemistry, 2RT-PCR, or 3Western blot.
  2. * The 60 kDa isoform is classified as cytoplasmic staining in immunohistochemistry; + weak presence, ++ moderate presence, or +++strong presence, N/D not determined.