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After World War II, blood groups became a symbol of anti-racial science. This paper aims to shed new light on the post-WWII history of blood groups and race, illuminating the postcolonial revitalization of racial serology in South Korea. In the prewar period, Japanese serologists developed a serological anthropology of Koreans in tandem with Japanese colonialism. The pioneering Korean hematologist Yi Samyŏl (1926-2015), inspired by decolonization movements during the 1960s, excavated and appropriated colonial serological anthropology to prove Koreans as biologically independent from the Japanese. However, his racial serology of Koreans shared colonial racism with Japanese anthropology, despite his anti-colonial nationalism.

By focusing on the emergence and integration of "hybrid children" (konketsuji) anthropology into the Human Adaptability section of the International Biological Program (HA-IBP) in Japan during the 1950s and 1970s, this paper presents how transnational dynamics and mechanisms played out in shaping and maintaining the racist aspects while simultaneously allowed them to be included in the HA-IBP framework. It argues that Japanese anthropologists operated a double play between their national and transnational spaces, that is, they attenuated racist aspects of their research in their international activities while authenticating race in their national work. This paper will conclude with reflections on the transnational nationalism of konketsuji anthropology. [ABSTRACT FROM AUTHOR]