Receptor expression-enhancing protein XLRAITRPLG LSLPLTVRRL GTRAYALRPP REEVWVSGSR NARRTKCERL IFGTLYPAYS SYKAVKTKNV KEYVKWMMYW IVFAFFTTAE TLTDIVLSWF PFYFELKIAF VIWLLSPYTK GSSVLYRKFV HPTLSNKEKE IDEYITQARD KSYETMMRVG KRGLNLAANA AVTAAAKGQG VLSEKLRSFS M