- Pancreatic islet cells express BST-1, a CD38-like surface molecule having ADP-ribosyl cyclase activity. Kajimoto, Y., Miyagawa, J., Ishihara, K., Okuyama, Y., Fujitani, Y., Itoh, M., Yoshida, H., Kaisho, T., Matsuoka, T., Watada, H., Hanafusa, T., Yamasaki, Y., Kamada, T., Matsuzawa, Y., Hirano, T. Biochem. Biophys. Res. Commun. (1996)