| Figure 1. Cultured normal HeLa cells. This cell line is derived from a human cervical epithelial tumor cell. |
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| Figure 1a. Cultured HeLa cells 24 hours after exposure to sulfur mustard. Note the loss of microvilli and multiple perforations and invaginations of the plasma membrane. |
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Major Randall E. Greenfield, Cindy A. Kronman, and Colonel David H. Moore. "Reducing Animal Research at the U.S. Army Medical Research Institute of Chemical Defense" Animal Welfare Information Center Newsletter, 8(3):6-7, Winter 1997/1998.