IL-2 is mainly produced in activated T cells and could be released into blood from them in vivo. The half-life of IL-2 is very short, less than 10 min in peripheral blood.

• 在体状态下，IL-2主要由活化的T细胞产生并可释放入血，但IL-2在外周血中的半衰期很短，还不足10min。