the validity of using different 15n-tracer substances to measure whole body protein parameters , i.e. , protein synthesis , protein breakdown , net protein gain , protein turnover , metabolic pool , and reutilization , was assessed by comparing the results obtained with : [ 15n ] glycine , a mixture of 10 15n-labeled amino acids , and a 15n-labeled chicken egg protein in two infants , 9 and 12 weeks old , who were fed human milk .
C0017890
glycine
C0002520
amino acids