infant rhesus monkeys were ( a ) fed a diet high in phenylalanine or ( b ) fed a diet high in p-chlorophenylalanine for the 1st 12 months of life , ( c ) selected from mothers fed a diet high in phenylalanine during pregnancy , ( d ) fed a diet low in phenylalanine , ( e ) maintained as controls , or ( f ) maintained as pair-fed controls .
C0030135
p-chlorophenylalanine
C0031453
phenylalanine