A pleiotropic cytokine central to the regulation of T-cell responses, interleukin 2 (IL-2), plays an essential role in a huge range of other immune modulatory actions. Image Credit: Sino Biological ...

Vitamin K is an essential vitamin that occurs in two forms, K-1 and K-2. Dietary sources of vitamin K-2 include animal proteins and fermented foods. The bacteria in the human gut also produce small ...