Prostaglandin D(2) (PGD(2)) is derived from arachidonic acid and binds with high affinity to the G-protein coupled receptors prostanoid DP(1) and DP(2). Interaction with DP(2) results in cell chemotaxis, eosinophil degranulation, eosinophil shape change, adhesion molecule upregulation and Th2 cytokine production. In allergic rhinitis and allergic asthma PGD(2) is released from mast cells in response to allergen challenge and may trigger symptoms such as sneezing, rhinorrhea, pruritus, mucus hypersecretion and pulmonary inflammation. GenScript's cloned human DP2-expressing cell line co-expressing Ga15 is made in the CHO-K1 host.