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Alignment of IL-6 sequences. An alignment was constructed of homologue IL-6 amino acid sequences from macaque (accession no. P51494), human (accession no. P05231), KSHV K2 (accession no. U75698), and RRV26-95 R2 by using CLUSTAL W software. Conserved cysteine residues that have been previously demonstrated to be necessary for IL-6 receptor binding are shaded in black. Deletion polymorphisms are indicated with dashes.
