Ready-to-use ELISA kits are available for the detection of Pgp1, an alias of the protein, CD44 molecule (Indian blood group). The official gene symbol is CD44. The protein, with a mass of 81.5 kDa and length of 742 residues, is reported to be membrane-associated. It may be known by other names, including: epican, chondroitin sulfate proteoglycan 8, Indian blood group antigen, Hermes antigen, GP90 lymphocyte homing/adhesion receptor, and CD44 antigen, and hematopoietic cell E- and L-selectin ligand.