[Standard structures in protein molecules. II. Beta-alpha hairpins].

Standard conformations of polypeptide chains folded into beta-alpha-hairpins are considered in the paper. It is shown that there is a limited number of standard beta-alpha-hairpins having relatively short connections in the proteins and each beta-alpha-hairpin has a strictly definite order of hydrophobic, hydrophilic and glycine residues in the amino acid sequence coding for it.