1. Herniated blastomere following chemically assisted hatching may result in monozygotic twins 
Tzong-Chyi Sheen, M.D., Su-Ru Chen, Heng-Kien Au, M.D., Yi-Yi Chien, M.D., Ko-Yi Wu, M.D., Chii-Ruey Tzeng, M.D. 
Fertility and Sterility 
Volume 75, Issue 2, Pages (February 2001)
DOI: /S (00)

2. Figure 1
One of the two transferred embryos on day 3 after oocyte retrieval. Following assisted hatching, the zona pellucida was broken (arrow) with a protruding blastomere (magnification, ×400).
Sheen. Monozygotic twins and assisted hatching. Fertil Steril 2001.
Fertility and Sterility  , DOI: ( /S (00) )