Arginase-1 (ARG1) protein, crucial in the urea cycle, converts L-arginine to urea and L-ornithine. ARG1 also regulates L-arginine levels outside the liver, impacting immune responses. ARG1's release by granulocytes suppresses T cell and NK cell functions. In ILC2s, ARG1 promotes lung inflammation. However, ARG1's role in human monocytic/macrophage/dendritic cells is unclear. Arginase-1/ARG1 Protein, Human (N-His) is the recombinant human-derived Arginase-1/ARG1 protein, expressed by E. coli , with N-6*His labeled tag.