FRANCIS LEROY & OLIVIER WAUTIER, BIOCOSMOS / SCIENCE PHOTO LIBRARY FRANCIS LEROY & OLIVIER WAUTIER, BIOCOSMOS / SCIENCE PHOTO LIBRARY
Animation highlighting the hydrogen bonds (red dotted lines) in a polypeptide that has folded into an alpha helix. The bonds form between the oxygen atom (red) of an amino acids carboxyl group and hydrogen atom (yellow) of the amino group of the amino acid (white) four residues away. These hydrogen bonds add to the stability of the polypeptide structure.
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