Module for the Construction of Biohybrid Light-Harvesting Antennas (image) Washington University in St. Louis Share Print E-Mail Caption Antennas are made up of modules: A two-peptide dyad (side view shown above) with the pair of bacteriochlorophyll molecules (purple) in the middle. The bacteriochlorophylls absorb light and trap the energy transferred from other pigments. The additional pigments are attached at carefully chosen sites (red, orange and yellow) on the beta peptide (the green helix), or the top end of the alpha peptide (blue helix). Credit Cogdell/Holten/PARC Usage Restrictions Please credit Share Print E-Mail 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.