Bone marrow hematopoiesis failure led by chemicals, radiation, biological factors and unknown etiology. The common clinical presentation is mild to severe pancytopenia
1918-1959, worked at Uni. of California. His stay at Uni. of California was interrupted, when he was dismissed for refusing to sign a loyalty oath. He led a fight against the loyalty oath as an infringement (违反,侵害) on academic freedom and was