The Atlantic Salmon 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. Atlantic Salmon IGF-1 applications are for cell culture, ELISA standard, and Western Blot Control. Atlantic Salmon IGF-1 Specifications: (Molecular Weight: 15.1 kDa) (Amino Acid Sequence: ATGAGPETLC GAELVDTLQF VCGERGFYFS KPTGYGPSSR RSHNRGIVDE CCFQSCELRR LEMYCAPVKS GKAARSVRAQ RHTDMPRTPK VSTAVQNVDR GTERRTAQHP DKTKTKKEVH QKNSSRGNTG GRNYRM). For research use only. Made in the USA