sentences:  In 1954-1955, he became an instructor in pathology at Duke University Hospital in Durham, North Carolina.He then returned to the University of Chicago in 1955 to complete a fellowship in hematology (research on iron enzymes and preleukemia), and he was appointed to the faculty as instructor in 1957 and assistant professor of medicine in 1958.In 1959, he was appointed Chief of Hematology and Research Associate at the Atomic Bomb Casualty Commission in Hiroshima and Nagasaki, Japan, where he did research on anemia, leukopenia, myelodysplasia in atomic bomb survivors, and adopted Mitsunori, a Japanese orphan.