"C444"^^ . "Diphtheria Toxin"^^ . "C0012550"^^ . "Diphtheria ToxinPTNCI" . "Diphtheria Toxin"^^ . "Diphtheria_Toxin"^^ . . "A 60 kD single chain protein elaborated by Corynebacterium diphtheriae that causes the sign and symptoms of diphtheria; it can be broken into two unequal fragments, the smaller (A fragment) inhibits protein synthesis and is the lethal moiety that needs the larger (B fragment) for entry into cells.MSH2002_06_01" . "Amino Acid, Peptide, or Protein"^^ . . . . . "Pharmacologic Substance"^^ .