title: Unstable ring Y chromosome in an aspermic male.
abstract: A ring Y chromosome was found in a male showing growth retardation and aspermia but normally developed external genitalia. The ring does not display either the characteristic brilliant Y fluorescence or the typical late-replicating heterochromatin.
mesh_terms: D000328:Adult; D002869:Chromosome Aberrations; D006130:Growth Disorders / Q000235:genetics; D006801:Humans; D007248:Infertility, Male / Q000235:genetics*; D008297:Male; D008938:Mitosis; D010641:Phenotype; D012730:Sex Chromosomes; D013091:Spermatogenesis; D014998:Y Chromosome