This rule is based on review evidence only: 15207811(R) 15351221(R)

Pdgf refers to a composite that consists of a homodimer or heterodimer of Pdgfa and Pdgfb.  Many sources to not make it clear which Pdgf they are using but it is likely that are using Pdgfa and/or Pdgfb but not Pdgfc or Pdgfd.

PdgfR refers to a composite that consists of a homodimer or heterodimer of PdgfRa and PdgfRb.
