in order to analyze this effect of aging , we determined five basic parameters of ach metabolism , including total acetylcholine ( ach ) and choline ( ch ) levels , 3h-ach , 3h-ch and 3h-phosphorylcholine ( phch ) formed from exogenous 3h-ch , for each experimental type and for the two ages .
C0031716
phosphorylcholine
C0008405
ch