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The human cytokine interleukin-1β (IL-1β) interacts with the interleukin type I receptor using two large docking surfaces designated A and B. Crystallographic studies reveal that a single histidine residue (His30) in IL-1β makes critical electrostatic interactions at the receptor/ligand interface. To study the function of this residue at site A, four mutant forms of IL-1β (H30A, H30D, H30F and H30R)...
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