Abstract
1. Vasa deferentia from guinea-pigs were exposed to 14C-SY28 HBr (5·32 × 10-6M) washed, lipid extracted, and broken up.
2. The tissue was digested with papain, hydrolyzed with 6 N HCl, and gel filtration performed.
3. Aliquots at each stage were used for paper chromatography and autoradiography.
4. Three labelled spots (in addition to unbound 2-halogenoalkylamine) were located from acid hydrolysate and a fourth from gel filtrate.
5. Selected amino-acids were complexed with 14C-SY28 and the procedure repeated. The RF values were compared with those of the same amino-acids with and without 6 N HCl.
6. Histidine, aspartic acid, arginine and serine gave a significant degree of binding of 14C-SY28.
7. The theoretical implications are discussed.
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