Light-induced changes in the structure of pigmented granules in aplysia neurons

Science  11 Apr 1975:
Vol. 188, Issue 4184, pp. 155-157
DOI: 10.1126/science.1114345


Pigmented granules in Aplysia neurons prepared in the dark contain material that appears to be composed of 50-angstrom globules and a precipitate, probably a calcium salt. On illumination the globules rearrange into paracrystalline arrays and membrane-like lamellae. The morphologic transformation may be related to calcium release from the granules, and the released calcium may mediate the light-evoked hyperpolarization described by others.