Pathology Immunity bf73aac5 Interleukin secreted by Th1 cells include? A IL-2 B IL-4 C IL-10 D IL-13 High-Yield Explanation Ans. (a) IL-2(Ref: Robbins 9th/198 )Cells of the TH1 subset secrete IL-2 for self activation & cytokine IFN-g, which is a potent macrophage activator.