Abstract

The suppressor activity of bone marrow cells not adhering to plastic is shown to appreciably increase after their 48-hour joint preincubation with mastocytoma P-815 supernatant or WEHI-3 myelomonocytic strain and to be unchanged after incubation with dupernatants of K-2 erythroleukemic strain or Ehrlich's ascitic carcinoma. P-815, WEHI-3, and K-2 tumors are shown to produce factors characterized by colony-stimulating activity.

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