Human organic anion transporting polypeptide 2B1 (OATP2B1) is a membrane transporter that facilitates the cellular uptake of a number of endogenous compounds and drugs. OATP2B1 is widely expressed in tissues including the small intestine, liver, kidney, placenta, heart, skeletal muscle, and platelets. It was recently shown that differential promoter usage in tissues results in expression of five OATP2B1 transcriptional start site variants that use distinct first exons but share common subsequent exons.
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