Purity: > 95 % by SDS - PAGE Format: Liquid in 20mM Tris pH 8.0, 0.1mM DTT, 10%glycerol. Visfatin is pre-B cell colony-enhancing factor 1(PBEF), which is predominantly secreted from visceral adipose tissue both in humans and mice. This protein has also been reported to be a cytokine (PBEF) that promotes B cell maturation and inhibits neutrophil apoptosis, or a visceral-fat derived hormone that acts by binding and activating the insulin receptor. Recombinant human visfatin, fused to His-tag at N-terminus, was expressed in E.coli and purified by using conventional chromatography techniques.