The TGF-β1 protein is a member of TGF-β family. TGF-βs are multifunctional set peptides that control proliferation, differentiation, and other functions in many cell types. TGF-βs act synergistically with TGFA in inducing transformation. It also acts as a negative autocrine growth factor. TGF-β1 plays an important role in controlling the immune system, and shows different activities on different types of cell, or cells at different developmental stages. Most immune cells (or leukocytes) secrete TGF-β1. 仅供实验室使用。