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. Synonyms: Pre-B-cell colony-enhancing factor 1, NAMPT, MGC117256, Nicotinamide phosphoribosyltransferase precursor, PBEF, PBEF1, VF, NAMPT, Visfatin, Nicotinamide phosphoribosyltransferase precursor, pre-B-cell colony enhancing factor 1,. NCBI no.: NP_005737