Lack of InsP3-evoked45Ca2+ release from permeabilized synaptosomes. A, Lack of A-23187-sensitive45Ca2+ incorporation into unlysed synaptosomes. B, Lack of InsP3-evoked45Ca2+ release from unlysed synaptosomes. C, ATP-dependent and A-23187-sensitive45Ca2+ incorporation into saponin-permeabilized synaptosomes. D, Lack of InsP3-evoked45Ca2+ release from saponin-permeabilized synaptosomes. E, Potent ATP-dependent and A-23187-sensitive45Ca2+ incorporation into microsomes. F, InsP3-evoked45Ca2+ release from microsomes. Other details are given in the legends of Figures 1 and2.