Ready-to-use ELISA kits are available for the detection of Ly65, an alias of the protein, bone marrow stromal cell antigen 1. The official gene symbol is BST1. The protein, with a mass of 35.7 kDa and length of 318 residues, is reported to be membrane-associated. It is a member of the ADP-ribosyl cyclase family and may be known by other names, including: cyclic ADP-ribose hydrolase 2, cADPr hydrolase 2, bone marrow stromal antigen 1, NAD(+) nucleosidase, ADP-ribosyl cyclase 2, and ADP-ribosyl cyclase/cyclic ADP-ribose hydrolase 2.