The Atlantic Salmon EGF yeast-derived recombinant protein is not tagged and is naturally endotoxin-free. The purity is greater than 98% as visualized by SDS-PAGE analysis. Atlantic Salmon EGF applications are for cell culture, ELISA standard, and Western Blot Control. Atlantic Salmon EGF Specifications: (Molecular Weight: 6.3 kDa) (Amino Acid Sequence: NTVESCPSSH DTYCLYEGVC FYFPEMESYA CNCISGYMGE RCQFSDLEWW ELQ). For research use only. Made in the USA