Induces phosphorylation of Tie-2 in primary cultured human and mouse vascular endothelial cells. More potent than native Ang-1. The fibrinogen-like domain (aa 284-498) of human Ang-1 (angiopoietin-1) is fused at the N-terminus to the coiled-coil domain of rat COMP (cartilage oligomeric matrix protein) and to a FLAG-tag. Produced in CHO cells.