Successful pregnancy and delivery from frozen-thawed embryos after intracytoplasmic sperm injection using round-headed spermatozoa and assisted oocyte activation in a globozoospermic patient with mosaic down syndrome Sung Tae Kim, M.S., Young Beom Cha, Jong Min Park, Myung Chan Gye, Ph.D. Fertility and Sterility Volume 75, Issue 2, Pages 445-447 (February 2001) DOI: 10.1016/S0015-0282(00)01698-8
Figure 1 Transmission electron microscopy of 100% round-headed spermatozoa from a patient with globozoospermia. Magnification, ×10,000. Kim. Pregnancy from frozen-thawed embryos. Fertil Steril 2001. Fertility and Sterility 2001 75, 445-447DOI: (10.1016/S0015-0282(00)01698-8)