Walterospermin amino acid sequence and putative structure. (A) Sequence alignment of walterospermin with homolog toxins retrieved from protein BLAST. GenBank accession codes for these retrieved sequences are: C1IC51 (Kln-III), C1IC50 (Kln-I), B6RLX2 (Oh-TCI), P82966 (Oh11-1), P20229 (NN), P00986 (NNV), P00985 (HHV) and P25660 (BF9). Hyphen-minus represents identical amino acid residues, and dots indicate the lack of residue at the position. The peptide lengths and percentages of sequence identities are given on the right. (B) SWISS-MODEL (http://swissmodel.expasy.org/) proposed 3D-structure of walterospermin. Red, α helix; green and yellow, β-strands; blue, N-terminal.