Recombinant human aFGF (acidic Fibroblast Growth Factor) is a disulfide-linked monomer protein consisting of 141 a.a. and migrates as an approximately 16 kDa protein under reducing and non-reducing conditions. Native human aFGF, generated by the proteolytic removal of the signal peptide and propeptide, has a calculated mass of 16 kDa. Optimized DNA sequence encoding human acidic Fibroblast Growth Factor mature chain was expressed in E. coli.