NICHOLS W W, LEVAN A, CORIELL L L, GOLDNER H, AHLSTROM C G
Science. 1964 Oct 9;146(3641):248-50. doi: 10.1126/science.146.3641.248.
Chromosome breakage was observed in human leukocytes in vitro when Schmidt-Ruppin strain of Rous sarcoma virus was added to the cultures. Similar additions of Bryan strain of Rous sarcoma virus had no such effect.