title: Is protein catabolism nonrandom?
mesh_terms: D000375:Aging; D000818:Animals; D002247:Carbon Isotopes; D008239:Lysine / Q000378:metabolism; D008297:Male; D051379:Mice; D011506:Proteins / Q000378:metabolism*; D013217:Starvation; D013997:Time Factors
chemical_list: D002247:Carbon Isotopes; D011506:Proteins; D008239:Lysine