Biochemistry of Brain and Behavior

ment of mental retardation as in the young human. These two facts together suggest that the disrup­ tion of brain protein synthesis by high phenylala­ mine levels in infants may account for the mental retardation observed later in these children. Much work remains to be done to confi~m this possibility. However, it is clear from the review and research described by Waisman that neurochemis­ try has the tools that will lead to an understand­ ing of - and therefore perhaps control of - these inbor