title: Studies in species adaptation; continuous exposure of paramecia to methylcholanthrene and other agents for more than five years.
authors.forename: R R
authors.initials: RR
authors.lastname: SPENCER
authors.forename: D
authors.initials: D
authors.lastname: CALNAN
mesh_terms: D056890:Eukaryota; D008748:Methylcholanthrene; D010247:Paramecium; D013045:Species Specificity
chemical_list: D008748:Methylcholanthrene