M-ENK

AcronymDefinition
M-ENKMethionine-Enkephalin
References in classic literature ?
He wishes his boys to be active and hardy; and if they misbehave, can give them a sharp word now and then; but he is an affectionate fathercertainly Mr.
However, she said, "Your servant, sir," and curtsied with an air of perfect deference as she advanced towards him: she was not the woman to misbehave towards her betters, and fly in the face of the catechism, without severe provocation.
Granted that they wished to misbehave, it was pleasant for them to be able to do so.
The effect of any one's anger on Rosamond had always been to make her shrink in cold dislike, and to become all the more calmly correct, in the conviction that she was not the person to misbehave whatever others might do.