FGF 23 Human Recombinant produced in E.coli is a single, non-glycosylated polypeptide chain expressed with -6xHis tag containing tot al of 257 amino acids (251 a.a. FGF23+ a.a. His tag) and having a molecular mass of 28629.5 Dalton. The FGF- 1 * 100 µG