Small inocula of primary plasma tumor cells which do not transplant i.p. unless recipients are conditioned with pristane do so readily when recipients are given i.p. injections of a peritoneal exudate induced by pristane inoculation, but free of pristane.

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This investigation was supported by Department of Health, Education and Welfare Grant P 30 14194 of the National Cancer Institute and BSRG 5589 awarded by the Biomedical Research Support Grant Program, Division of Research Resources, NIH.

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