PECAM1 and plasma cell myeloma: According to the specification of antibodies, gP-CD31 is a 130 kDa type I transmembrane glycoprotein adhesion molecule in the immunoglobulin superfamily42,43, its immunogen is mouse myeloma cell line NS0-derived recombinant mouse CD31/PECAM-1 (Glu18-Lys590, Accession # Q08481).