Amnesia 2 Animal 2 Avoidance Learning 2 CO 2 Carbon Monoxide 2 Haem oxygenase 2 Heme Oxygenase (Decyclizing) 2 Hippocampus 2 Inhibitory avoidance 2 Long-Term Potentiation 2 Male 2 Rats 2 Rats, Wistar 2 Support, Non-U.S. Gov't 2 Time Factors 2 Zinc 2 Zn-pro-toporphyrin-ix 2 animal experiment 2 animal tissue 2 article 2 avoidance behavior 2 brain cortex 2 carbon monoxide 2 cerebellum 2 controlled study 2 hippocampus 2 learning 2 male 2 memory 2 nonhuman 2