title: High levels of vitamin B 12 versus minimum requirement: biological and behavioral differences.
mesh_terms: D000367:Age Factors; D000818:Animals; D001362:Avoidance Learning / Q000187:drug effects*; D005556:Form Perception / Q000187:drug effects*; D007274:Injections, Intraperitoneal; D008297:Male; D009751:Nutritional Requirements; D051381:Rats; D011919:Rats, Inbred Strains; D013028:Space Perception / Q000187:drug effects*; D013045:Species Specificity; D013997:Time Factors; D014805:Vitamin B 12 / Q000008:administration & dosage / Q000494:pharmacology*
chemical_list: D014805:Vitamin B 12