CHI-Fold Proteins (image) Salk Institute Caption Overlay of the known structures of CHI-fold proteins from Arabidopsis thaliana and alfalfa (Medicago sativa). Protein backbones are shown as ribbons, with β-strands depicted as flat arrows (blue), α-helices as broad coils (orange), and loops as thin rope (gray). The various bound ligands in these proteins (naringenin in alfalfa CHI, and fatty acids in AtFAP1 and AtFAP3) are shown as van der Waals spheres. Credit Courtesy of the Salk Institute for Biological Studies Usage Restrictions News media reproduction to illustrate this story permitted with proper attribution as provided above. For one time use only. Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.