Bends in alpha helix structure are formed by which amino acid?

Amino Acids not Found in Alpha Helix are: Proline: Because of a secondary amino group, it introduces kinkin helix Glycine: Because of small side chain it creates a sharp bend in the structure (Glycine impas flexibility to proteins) Amino acids with bulky R groups: e.g. Tryptophan Charged amino acids like Aspaate, Glutamate Amino acid with branch chain at beta carbon - Valine