the use of thousands of human guinea pigs for medical experimentation. The vast majority of these human subjects are believed to have been Chinese nationals taken prisoner over the course of the Second Sino-Japanese war that originated in the Japanese invasion of Manchuria in September 1931, and that grew to full-blown warfare in July 1937. Men, women, and children of other nationalities were also used for experiments, and babies born to women in Unit 731’s custody apparently were not spared either.
