The Feline 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. Feline IL-4 applications are for cell culture, ELISA standard, and Western Blot Control. The Feline IL-4 yeast-derived recombinant protein can be purchased in multiple sizes. Feline IL-4 Specifications: (Molecular Weight: 12.6 kDa) (Amino Acid Sequence: QNFNNTLKEI IKTLNILTAR NDSCMELTVM DVLAAPKNTS DKEIFCRATT VLRQIYTHHN CSTKFLKGLD RNLSSMANRT CSVNEVKKCT LKDFLERLKA IMQKKYSKH (109)) (Gene ID: 751514).