structure of cholera holotoxin, crystal form 1

adp background bacterium biochemistry biology biomolecule cartoon chain chemistry cholera cholerae coil color computer control diarrhea dimensional disease enterotoxin exotoxin gaussian generated graphic green health helix heterohexamer holotoxin illustration infection inhibitor isolated medicine model molecule peptide poison protein quaternary red ribbon ribosylating science secondary shape sheet strand structure surface tertiary three toxin vibrio white