title: Polymorphism of human constitutive heterochromatin.
abstract: Genetic polymorphism has been demonstrated in man for many characteristics including blood groups, serum proteins, tissue enzymes, and hemoglobins. A class of chromosomal polymorphism involving constitutive heterochromatin has now been found. Through the use of a special technique that permits visualization of heterochromatin, seven heterochromatin variants have been found among four individuals. These results suggest a very high frequency of variability of heterochromatin in the population.
mesh_terms: D002900:Chromosomes, Human, 1-3; D002901:Chromosomes, Human, 13-15; D002902:Chromosomes, Human, 16-18; D002903:Chromosomes, Human, 19-20; D002904:Chromosomes, Human, 21-22 and Y; D002906:Chromosomes, Human, 6-12 and X; D004247:DNA; D006570:Heterochromatin; D006801:Humans; D008214:Lymphocytes; D008722:Methods; D009691:Nucleic Acid Denaturation; D009695:Nucleic Acid Renaturation; D011110:Polymorphism, Genetic
chemical_list: D006570:Heterochromatin; D004247:DNA