The Feline LIF yeast-derived recombinant protein is not tagged and is naturally endotoxin-free. The purity is greater than 98% as visualized by SDS-PAGE analysis. Feline LIF applications are for cell culture, ELISA standard, and Western Blot Control. Feline LIF yeast-derived recombinant protein can be purchased in multiple sizes. Feline LIF Specifications: (Molecular Weight: 19.7 kDa) (Amino Acid Sequence: SPLPITPVNA TCATRHPCHS NLMNQIRNQL AQLNGSANAL FILYYTAQGE PFPNNLDKLC GPNVTDFPPF HANGTEKTRL VELYRIIAYL GASLGNITRD QKVLNPNALS LHSKLNATAD IMRGLLSNVL CRLCNKYHVA HVDVAYGPDT SGKDVFQKKK LGCQLLGKYK QVIAVVAQAF [Met139Val](180)) (Gene ID: 101090296). For research use only. Made in the USA