CD38 is an ectoenxyme that utilizes NAD(+) and is expressed by many ce
lls of hematopoietic origin. Antibodies to CD38 Potentiate many biolog
ical activities on lymphocytes, including induction of murine B-cell p
roliferation. In this article, Frances Lund and colleagues summarize i
nformation concerning the expression, enzymatic activity and signal tr
ansduction pathway utilized by murine CD38.