Figure 5. The production of interleukin (IL)-4 in cultures of normal T cells stimulated with recombinant monocyte chemoattractant protein 1 (rMCP-1). Normal T cells (cell density, 2 × 10⁶ cells/mL) were cultured for 24 hours in the presence of various concentrations of rMCP-1. Culture fluids harvested from these cell cultures were assayed for IL-4 by enzyme-linked immunosorbent assay. Each point indicates the mean ± standard deviation of triplicate wells.