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12/26 ![PDB101 News](https://cdn.rcsb.org/rcsb-pdb/v2/common/images/logo_pdb101_tiny.png)
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Cyano-bacteria obtain energy from photosynthesis. To optimize their life processes and energy production during the illuminated portion of the day, they utilize a circadian system. The animation presents a simplified view of the protein-protein interactions in the cyano-bacterial circadian system using the PDB structures 5n8y and 2gbl. Read the Molecule of the Month on Circadian Clock Proteins to learn how they measure time in our cells.