title: The effect of X-rays on strains and syngens of Paramecium aurelia differing in genetic affinity.
mesh_terms: D000818:Animals; D003227:Conjugation, Genetic / Q000528:radiation effects; D007620:Karyometry; D010247:Paramecium / Q000528:radiation effects*; D011829:Radiation Dosage; D011831:Radiation Genetics; D013997:Time Factors