Abstract Background Mast cell-derived prostaglandin D2 (PGD2). may contribute to eosinophilic inflammation and mucus production in allergic asthma. Chemoattractant receptor homologous molecule expressed on TH2 cells (CRTH2). a high affinity receptor for prostaglandin D2. https://www.deltarenewablepower.com/product-category/dog-treats/