as to the fragments of met-enkephalin degraded by brain homogenate after i.p . administration of thiorphan , the concentration of tyrosine and tyrosyl-glycine ( tyr-gly ) was the same as that of the vehicle control , whereas only the amount of tyrosyl-glycyl-glycine ( tyr-gly-gly ) decreased to 21.5 % of the control value after 30 min , and then it recovered to 75 % after 180 min .
C0006104
brain
C0086045
concentration