Y-chromosomes from skeletal remains of Chinese Expeditionary Force offer a clue to their paternal relatives

Chinese Expeditionary Force(CEF)was one of the two Chinese military excursions outside of sovereign Chinese territory sent to repel Japanese forces occupying Burma during World War II.By 1941,the World War II entered its darkest days.China had been embroiled in a desperate struggle to resist the Japanese invasion.Japanese troops aiming at cutting the supply routes to China had left only one line of communication open for China to the West—the Yunnan-Burma Road in the southwest[1].To co-operate