title: A rare heterochromatic variant of chromosome 4.
abstract: A variant chromosome 4 with a large G positive heterochromatic block is described and discussed in relation to chromosome 4 heteromorphisms observed with other banding techniques. The extra heterochromatin is C positive and fluoresces brilliantly with Q banding, but differs from Yqh with some methods of staining.
mesh_terms: D000649:Amniocentesis; D002871:Chromosome Banding; D002905:Chromosomes, Human, 4-5 / Q000648:ultrastructure*; D005260:Female; D006570:Heterochromatin / Q000648:ultrastructure*; D006801:Humans; D007621:Karyotyping; D011247:Pregnancy
chemical_list: D006570:Heterochromatin