+"731" refers to Unit 731, a covert biological and chemical warfare research unit of the Imperial Japanese Army during [World War II](/wiki/World_War_II). It conducted lethal [Human Experimentation](/wiki/Human_Experimentation) on captives, leaving a dark legacy of suffering and ethical breaches.
+## See also
+- [War Crimes](/wiki/War_Crimes)
+- [Biological Warfare](/wiki/Biological_Warfare)
+- [Medical Ethics](/wiki/Medical_Ethics)
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