Term Name:	pi_helix
Synonyms:	pi helix
Definition:	The pi helix has 4.1 residues per turn and a translation of 1.15 (=0.115 nm) along the helical axis. The N-H group of an amino acid forms a hydrogen bond with the C=O group of the amino acid five residues earlier.
Ontology:	Sequence Ontology [SO:0001118]