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Patent Pending Prostaglandin D2 (or PGD2) is a prostaglandin that binds to the receptor PTGDR, as well as CRTH2.[1][2] It is a major prostaglandin produced by mast cells – recruits Th2 cells, eosinophils, and basophils. In mammalian organs, large amounts of PGD2 are found only in the brain and in mast cells. It is critical to development of allergic diseases such as asthma.