The IGF-1 yeast-derived recombinant protein is not tagged and is naturally endotoxin-free. The purity is greater than 98% as visualized by SDS-PAGE analysis. IGF-1 applications are for cell culture, ELISA standard, and Western Blot Control. IGF-1 yeast-derived recombinant protein can be purchased in multiple sizes. IGF-1 Specifications: (Molecular Weight: 7.6 kDa) (Amino Acid Sequence: GPETLCGAEL VDALQFVCGD RGFYFNKPTG YGSSSRRAPQ TGIVDECCFR SCDLRRLEMY CAPLKPAKSA (70)) (Gene ID: n/a). For research use only. Made in the USA