1. 1. The study was undertaken to obtain some information about the development of the autonomic receptors and the AChE activity in the rat vas deferens. 2. 2. The results suggest that the adrenoceptors were fully developed at birth. 3. 3. The M1-ACh receptors were developed before the M2-ACh receptors. 4. 4. The AChE activity developed before the ACh muscarinic receptors of the rat vas deferens.
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