Diagram of a Cryptophyte Cell (IMAGE) Ruhr-University Bochum Caption This is a schematic of the complex construction of a cryptophyte cell. The barrel-like docking enzyme GtCPES is found in an inner compartment, the chloroplast stroma. Here, the enzyme is responsible for the transport and docking of the magenta-colored pigment phycoerythrobilin to the phycobiliprotein structure. Credit Kristina Overkamp Usage Restrictions None License Licensed content 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.