AUSCHWITZ. Dachau. Ping Fan. Changchun. In the shorthand of World War II atrocities, some names are more recognizable than others.
But while Nazi scientists like Josef Mengele conducted hideous experiments on concentration camp prisoners, their lesser-known Japanese counterparts, led by Gen. Shiro Ishii, were waging full-scale biological warfare and subjecting human beings to ghastly experiments of their own -- and on a far greater scale than the Germans.
''Imagine hundreds of Mengeles,'' said Rabbi Abraham Cooper of the Simon Wiesenthal Center in Los Angeles, who has been calling on the Japanese to face up to their past as openly as the Germans have.
Ping Fan, built by General Ishii, the mastermind of Japanese germ warfare and its infamous Unit 731, was a camp of plague-bearing fleas, rat cages and warrens for human guinea pigs. Changchun, 150 miles south, was another huge installation for germ tests on plants, animals and people.
Though not approaching the systematic exterminations by the Nazis, the Japanese record of atrocities -- what victims call ''the Asian Holocaust'' -- is still producing revelations more than 50 years after the end of World War II. The delay illustrates the West's Eurocentric view of wartime suffering as well as striking differences in the willingness of the two former Axis allies to come to terms with their past. It has also thrown a harsh light on cold-war rivalries. As early as 1949, the Soviet Union convicted 12 Japanese for biological war crimes. Although the published transcript contained exhaustive details of Unit 731's crimes, the accounts were largely ignored or dismissed in the West as Communist propaganda. The Allies did, however, prosecute 5,570 Japanese, but none for biological warfare.