The lack of requirement for glycine in the growing chick.
D000824:Animal Nutritional Physiological Phenomena; D000818:Animals; D001120:Arginine / Q000378:metabolism; D002645:Chickens / Q000254:growth & development*; D004044:Dietary Proteins; D005998:Glycine / Q000378:metabolism*; D012694:Serine / Q000378:metabolism
D004044:Dietary Proteins; D012694:Serine; D001120:Arginine; D005998:Glycine