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Expression of ΔTrkA in 32D myeloid cells promotes growth in low concentrations of IL-3. 32D cells stably expressing empty vector, TrkA, or ΔTrkA were plated under suboptimal IL-3 conditions (0.5% WEHI-cm). Total viable cells were determined over time by trypan blue exclusion. Nearly identical results were obtained from the two independently derived sets of cell lines that were analyzed.
