title: Young rats need unknown growth factors (McCollum, 1913-1917).
authors.affiliation: Department of Chemistry, Indiana University, Bloomington 47405-6203, USA.
authors.forename: H G
authors.initials: HG
authors.lastname: Day
mesh_terms: D000821:Animal Feed; D000818:Animals; D006128:Growth; D049673:History, 20th Century; D009751:Nutritional Requirements; D051381:Rats