1. Absence of deleted in azoospermia (DAZ) genes in spermatozoa of infertile men with somatic DAZ deletions 
Jan W.A de Vries, Sjoerd Repping, Robert Oates, M.D., Ph.D., Ronald Carson, Ph.D., Nico J Leschot, M.D., Ph.D., Fulco van der Veen, M.D., Ph.D. 
Fertility and Sterility 
Volume 75, Issue 3, Pages (March 2001)
DOI: /S (00)

2. Figure 1
Fluorescence in situ hybridization (FISH) of sperm cells. (a): Donor sperm cells. (b): Patient sperm cells. In a, cells labeled A are the Y-bearing spermatozoa, containing both Y heterochromatin (green signal; PY3.4) and the DAZ gene clusters (red signal; 18E8). Cells labeled B are X-bearing spermatozoa containing the X centromere (yellow signal; PBAMx5). In b, only the green signal of the Y heterochromatin (PY3.4) is visible in these cells. A DAZ signal is not detected.
de Vries. DAZ detection in spermatozoa of ICSI patients. Fertil Steril 2001.
Fertility and Sterility  , DOI: ( /S (00) )