... a novel peptide from the Mexican scorpion Centruroides noxius with a typical b-toxin sequence but with a- like physiological activity Federico del Rı´o-Portilla1, Elizabeth Herna´ndez-Marı´n1, ... 2, using the CLUSTAL Xprogram,shows a clear cut separation of all the b Na-ScTxs from all the a Na-ScTxs. The a Na-ScTxs have identities of the order of 50% among themselves, the same being ... 4876–4882.46.Inceoglu,B.,Lango,J.,Wu,J.,Hawkins,P.,Southern,J.&Hammock, B.D. (2001) Isolation and characterization of a novel type of neurotoxic peptide from the venom of the South African scorpion Parabuthus transvaalicus...