May inhibit voltage-gated sodium channels (Nav). Each Am I peptide may contain 2 disulfide bonds. The precursor protein seems to be processed in the following sequence: release of the signal peptide and of the propeptide, production of six identical 34-residue peptides by cleavage between Arg and Glu, release of four N-terminal and three C-terminal residues from each peptide and hydroxylation of each Pro in position 6 of the resulting 27-residue peptides. The measured mass is that of any peptide toxin Am-1. LD(50) is 830 ug/kg into crabs. Belongs to the sea anemone structural class 9a family.