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Polio Virus Receptor (PVR) is a member of Ig-superfamily with 3 Ig-domains in arrangement V-C-C. Four mRNAs are produced from single gene for PVR, (mapped to human chromosome band 19q13.1-13.2). Two of the mRNAs (called H20A and H20B or alpha and delta) encode cell surface molecules of about 43kDa and 45kDa polypeptide backbone, respectively. Two other splice variants, beta and gamma encode secreted molecules of about 44kDa. The cytoplasmic tails are short (aa 35-50) and are rich in serine phosphorylated residues.