Certain cells of the human immune system produce the cytokin…
Certain cells of the human immune system produce the cytokine IL-4 (a protein). The experiment below is related to IL-4. “Human immune cells were exposed to E. coli bacteria, and the amount of IL-4 was measured over time (0 hours, 6 hours, 12 hours and 18 hours after exposure). The amount of β-actin was also measured as a control.” What kind of experimental technique was used?