Figure 1.

Helical wheel projections of α-helix peptides. The size of the circle is proportional to amino acid volume. Yellow indicates hydrophobic residues, blue indicates positively charged residue, purple indicates polar uncharged residue, and grey indicates the 2 smallest amino acids; glycine (G; polar uncharged residue) and alanine (A; hydrophobic residue). N and C letters represent N-terminus and C-terminus, respectively. The direction and length of the µH vector are represented by the arrow. * Opposite direction, a mirror image, to the figure presented (l-enantiomer).