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The results of secondary structure prediction. The sequence underlined with a single line is a signal sequence, the arrow denotes the signal sequence cleavage site, and underlined with wavy lines are the two highly conserved domains. Cysteine residues forming disulfide bonds are marked with gray circles. The conserved amino-acid residues Arg-33 and Tyr-123 are marked with a gray box and a white circle. Letters A to E refer to the α-helices in bovine IFN-α1. IFN-α1, interferon α1.
