Demerec, M UNEQUAL BREAKS IN TWO SISTER CHROMATIDS INDUCED BY X-RAYS IN DROSOPHILA MELANOGASTER. [electronic resource] - Proceedings of the National Academy of Sciences of the United States of America Aug 1940 - 532-6 p. digital Publication Type: Journal Article ISSN: 0027-8424 Standard No.: 10.1073/pnas.26.8.532 doi