1. Maturation and apoptosis of human oocytes in vitro are age-related
Ji Wu, M.D., Ph.D., Lizhu Zhang, M.D., Xiuyun Wang, M.D. 
Fertility and Sterility 
Volume 74, Issue 6, Pages (December 2000)
DOI: /S (00)

2. Figure 1
(A), Example of intact mature oocyte; (B,C), Examples of occurrence of cytoplasmic condensation and fragmentation. (Bar = 25 μm).
Wu. Human oocyte maturation and apoptosis. Fertil Steril 2000.
Fertility and Sterility  , DOI: ( /S (00) )

3. Figure 2
(A), The oocyte positively stained for DNA fragmentation (arrowhead) (×400). (B), Negative control had TDT omitted (×400). (C), The oocyte exhibited positive staining for the Fas antigen. (Bar = 25 μm.) (D), Negative control. (Bar = 25 μm.)
Wu. Human oocyte maturation and apoptosis. Fertil Steril 2000.
Fertility and Sterility  , DOI: ( /S (00) )