the opiate receptors of central neurons related to the generation of the respiratory rhythm were identified using microiontophoresis of the synthetic opioid peptides dslet ( tyr-d-ser-gly-phe-leu-thr ) and trimu-4 ( tyr-d-ala-gly-nh-ch ( ch3 ) -ch2-ch ( ch3 ) 2 ) , exhibiting a high selectivity for delta and mu receptors respectively .
C0034801
opiate receptors
C0066908
mu receptors