MOESM1 of Metformin improves the angiogenic functions of endothelial progenitor cells via activating AMPK/eNOS pathway in diabetic mice

Additional file 1: Figure S1. Serum concentration of SDF-1α protein in mice determined by ELISA. The serum concentration of SDF-1α protein was not changed after metformin treatment (n = 5 per group).