We synthesized a novel ligand [4,5-3H-Leu9]-Neurokinin A (3H-NKA, S.A 117-144 Ci/mmol), and evaluated its binding to hamster urinary bladder membranes (HUBM). The ligand bound to HUBM in a highly-specific (94 +/- 4%) and protein-dependent manner. Binding was rapid (k1 = 0.037 nM-1*min-1) and saturable (Bmax = 1210 +/- 177 fmol/mg protein), to a single… (More)
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