Fluorescent evidence for spermatocytes with two Y chromosomes in an XYY male.
D005453:Fluorescence; D006801:Humans; D008297:Male; D008540:Meiosis; D012729:Sex Chromosome Aberrations / Q000235:genetics*; D012730:Sex Chromosomes; D013094:Spermatozoa / Q000166:cytology*; D013737:Testis / Q000166:cytology; D014466:Ultraviolet Rays