This family consists of Magi peptide toxins (Magi 1, 2 and 5) isolated from the venom of Hexathelidae spider. These insecticidal peptide toxins bind to sodium channels and induce flaccid paralysis when injected into lepidopteran larvae. However, these peptides are not toxic to mice when injected intracranially at 20 pmol/g [1].

1: Distinct primary structures of the major peptide toxins from the venom of the spider Macrothele gigas that bind to sites 3 and 4 in the sodium channel. Corzo G, Gilles N, Satake H, Villegas E, Dai L, Nakajima T, Haupt J; FEBS Lett 2003;547:43-50. PMID:12860384