An online BLAST search showed that µ-TRTX-Hl1a had considerable sequence similarity with other spider toxins such as JZTX-59 (U29-TRTX-Cj1a), toxic peptide C (U1-NETX-Csp1a) and Aps III (µ-CUTX-As1a). Toxic peptide C and Aps III appear to be pore blockers and bind to ...