A secondary structure of proteins that is a right-handed helix or coil, where each amino (N-H) group of the peptide backbone contributes a hydrogen bond to the carbonyl(C=O) group of the amino acid four residues N-terminal to it (n-4). It is the most common type of secondary structure.
    

concept

Toxic shock syndrome toxin

Staphylococcal enterotoxin A

Ferritin subunit - molecular model

Histidine phosphocarrier protein, mol. model

Antidepressant drug blocking dopamine transporter protein

Staphylococcal enterotoxin C2

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Staphylococcal enterotoxin C2

Histidine phosphocarrier protein, mol. model

Toxic shock syndrome toxin

Histidine phosphocarrier protein, mol. model

Histidine phosphocarrier protein, mol. model