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THE SUBCELLULAR DISTRIBUTION OF ENDOGENOUS AND EXOGENOUS SEROTONIN IN BRAIN TISSUE: COMPARISON OF SYNAPTOSOMES STORING SEROTONIN, NOREPINEPHRINE, AND γ‐AMINOBUTYRIC ACID 1

Abstract— We have studied the subcellular distribution of exogenous and endogenous serotinin in slices from the hypothalamus and midbrain of several species. In a procedure which appears to label the endogenous pools, tissue slices were incubated with low concentrations of [3H]5‐HT (5 × 10‐8 M), for 45 min, when there was apparent equilibrium between [3H]5‐HT of tissue and medium. After the tissue slices were homogenized in 0‐32 M‐sucrose and subjected to differential centrifugation, the distribution of exogenous and endogenous 5‐HT in pellets and supernatant fluid was similar.