title: Ring formation of chromosomes nos. 19 and 20.
mesh_terms: D000328:Adult; D002648:Child; D002869:Chromosome Aberrations; D002903:Chromosomes, Human, 19-20; D005260:Female; D006801:Humans; D008214:Lymphocytes / Q000166:cytology; D008856:Microscopy, Fluorescence; D009030:Mosaicism