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N-terminal amino acid sequences of a 4.9-kDa subunit of the S. occidentalis killer protein. Fifteen NH2-terminal amino acid residues were displayed in a one-letter code. Residues 3 to 14 from the 4.9-kDa subunit were aligned with residues 271 to 282 from the K2 toxin. The solid lines indicate identical residue; the dotted line indicates similar residue.
