Born in Korea-adopted apart: Behavioral development of monozygotic twins raised in the United States and France

•First case study of twins born in Korea and raised apart as minorities.•Study confirms previous findings of striking similarities and some differences in identical twins reared apart.•Findings are discussed with reference to previous reared apart twin studies.

Monozygotic (MZ) twins raised in different countries and cultures are rare. This report examines behavioral and physical similarities and differences of MZ female twins from South Korea, but raised separately in the United States and France. Analyses of the twins’ intelligence, special cognitive abilities, personality traits, self-esteem, job satisfaction and health histories are considered with reference to their genetic relatedness and rearing conditions. Both striking similarities and intriguing differences were noted.