Faed M, Robertson J, MacIntosh W G, Grieve J
Hum Genet. 1976 Aug 30;33(3):341-7. doi: 10.1007/BF00286865.
Testicular histology and meiosis has been studied in an XYY male patient identified at an infertility clinic. This man was found to have an XYY set chromosome complement in 15% of spermatogonial metaphases. There was no evidence of 2 Y chromosomes at diakinesis but there appeared to be a slight excess of sperm with a fluorescent Y body.