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Rat brain synaptosomes are shown to contain functional voltage-sensitive Ca*+ channels that are inhibited by organic Ca*+ channel blockers. Depolarization of synaptosomes with high K+ stimulates uptake of 45Ca2+ which is biphasic in its time course. Replacement of external Na+ with choline eliminates the slower phase of depolarization-stimulated Ca*+ uptake, leaving only a rapid uptake process which terminates within 1 sec. This rapid, tetrodotoxin-insensitive Ca*+ uptake can be inactivated bydoi:10.1523/jneurosci.05-03-00841.1985 pmid:2579220 fatcat:7fqayjjpd5ge7dyr37op7andp4