The Flying Fox Bat IL-4 yeast-derived recombinant protein is not tagged and is naturally endotoxin-free. The purity is greater than 98% as visualized by SDS-PAGE analysis. Flying Fox Bat IL-4 applications are for cell culture, ELISA standard, and Western Blot Control. Flying Fox Bat IL-4 yeast-derived recombinant protein can be purchased in multiple sizes. Flying Fox Bat IL-4 Specifications: (Molecular Weight: 12.8 kDa) (Amino Acid Sequence: HRYSITLEEI IKTLNILTTR KDWCMELMVA DVFAAPKNTA EEEIFCRAVT VLRKVYKHHE CVNRKFLGKL DRNLRSMARD YCPVEEAKKD TLKNVLETLR KTMQEKYSKS WS). For research use only. Made in the USA