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Multiple sequence alignment of the major short neurotoxins (SNTX) and long neurotoxins (LNTX) from Hydrophis curtus (Penang) and related representative species of sea snakes, sea kraits and cobras. All SNTX shared highly conserved cysteine residues and four disulphide bridges that reinforce the three-finger structure of the molecule. LNTX has an additional fifth disulphide bond in the second loop, except Ls3 from Laticauda colubrina.
