these results suggest that the guinea-pig esophageal muscularis mucosae has excitatory alpha 1 adrenoceptors and inhibitory beta 1 adrenoceptors , and the alpha 1 , but not beta 1 , adrenoceptors may link with the endogenous arachidonic acid cascade .
C0001642
beta 1 adrenoceptors
C0034783
adrenoceptors