title: C and Q bands in long arm of Y chromosomes; are they identical?
abstract: A phenotypically normal male has a small Y chromosome with no Yq fluorescence, but displays constitutive heterochromatin on the end of Yq. C and Q bands on Yq therefore need not be necessarily identical.
mesh_terms: D006570:Heterochromatin / Q000032:analysis; D006801:Humans; D008297:Male; D011797:Quinacrine Mustard; D012729:Sex Chromosome Aberrations / Q000175:diagnosis; D012730:Sex Chromosomes / Q000032:analysis; D013194:Staining and Labeling
chemical_list: D006570:Heterochromatin; D011797:Quinacrine Mustard