2INT:
reference: Crystal structure of recombinant human interleukin-4., Walter MR, Cook WJ, Zhao BG, Cameron RP Jr, Ealick SE, Walter RL Jr, Reichert P, Nagabhushan TL, Trotta PP, Bugg CE, J Biol Chem 1992 Oct 5;267(28):20371-6. PMID: 1400355

This OCA Structure page
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