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Hsu, T. , and Merchant, D. , /. Nati. Cancer Inst. 26, 1075 (1961). Jacobs, P. , Court Brown, W. , Nature 191, 1178 (1961). Jacobs, P. , Court Brown, W. , Nature 187, 1080 (1963). , Nature 190, 372 (1961). , Proc. Japan Acad. 35, 253 (1959). Rothfels, K. , Kupelwieser, E. , and Parker, R. C , Can. Cancer Conf. 5, 191 (1963). Russell, L. , and Major, M. , Genetics 42, 161 (1957). Sharman, G. , Intern. J. Radiation Biol. 1, 115 (1959). PHASE CINEMATOGRAPHY STUDIES ON THE EFFECTS OF RADIATION AND OF SOME CHEMICALS ON CELLS AND CHROMOSOMES1 YUH H.

At first sight the disappearance of the clone in the seventh transplant generation appears to be a contradiction. However, when chromosomally marked bone marrow cells from a normal unirradiated mouse are serially transplanted into irradiated hosts they invariably disappear after two, three, or more transfers, as indeed they did in the present experiment. Natural aging and forced proliferation could be factors contributing to this eventual failure to multiply competitively. And if this can happen to the descendants of normal cells it is not surprising that even a highly "successful" clone should also eventually go into decline.

It will be seen that this clone was overwhelmingly dominant in the bone marrow and spleen for three transplant generations. Furthermore, since it was present in all the animals of the fourth generation that were examined it must have arisen from an irradiated cell of the third generation host, if not an earlier one. The only possible conclusion is that this clone had a considerable selective advantage over the descend­ ants of the surviving cells in its successive irradiated hosts. At first sight the disappearance of the clone in the seventh transplant generation appears to be a contradiction.

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