Partial deletion of chromosome 8 β-defensin cluster confers sperm dysfunction and infertility in male mice. oleh Yu S Zhou, Sheila Webb, Laura Lettice, Steve Tardif, Fiona Kilanowski, Christine Tyrrell, Heather Macpherson, Fiona Semple, Peter Tennant, Tina Baker, Alan Hart, Paul Devenney, Paul Perry, Tracey Davey, Perdita Barran, Chris L Barratt, Julia R Dorin