Thapsigargin, a tumor promoter, discharges intracellular Ca2+ stores by specific inhibition of the endoplasmic reticulum Ca2+-ATPase. - Thastrup,O.; Cullen,P.J.; Drobak,B.K.; Hanley,M.R.; Dawson,A.P. (Proc Natl Acad Sci, 1990)