title: Ultracentrifugal analysis of the crystalline toxin and isolated fractions of Clostridium botulinum type A.
mesh_terms: D003014:Clostridium botulinum / Q000032:analysis*; D006863:Hydrogen-Ion Concentration; D005779:Immunodiffusion; D008970:Molecular Weight; D014118:Toxins, Biological / Q000032:analysis*; D014461:Ultracentrifugation
chemical_list: D014118:Toxins, Biological