[Preliminary studies of Conus geographus venom structural properties: evaluation of the toxin's molecular weight].

Venom from the posterior half of the venom duct of Conus Geographus was toxic to mice but without effect on a crab, and produced a flaccid spasmodic paralysis in mice. The minimum lethal dose for mice ranged from 5 micrograms to 50 micrograms (net weight) of venom per mouse. Toxin was submitted to Sephadex G 25 chromatography and to ultrafiltration. The venom was inactivated by pronase. The data suggested that the toxin was a peptide of molecular weight of about 1 500-2 000.