we have previously reported that the population of mesenteric lymph node cells from normal balb/c mice infected 14 days with the rodent nematode nippostrongylus brasiliensis ( nb-mln ) contains a nongranulated mast cell-committed progenitor ( mccp ) which does not require il-3 for proliferation and differentiation if either a fibroblast monolayer or soluble factors produced by monolayers of 3t3 fibroblasts or embryonic skin are present in the culture .
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