Liver 30 article 30 nonhuman 26 Animal 24 Rats 24 animal 24 rat 24 animal experiment 22 glycogen liver level 22 animal tissue 20 Animals 18 controlled study 18 metabolism 18 Liver Glycogen 16 female 16 liver 16 liver level 16 animal model 14 male 14 priority journal 14 Mice 12 Support, Non-U.S. Gov't 12 enzymology 12 glycogen 12 mouse 12 5 aminolevulinate synthase 10 Animalia 10 Female 10 Glucose 10 Heme 10