Illustration of Photosystem II (IMAGE)

Umea University

Illustration of Photosystem II

Caption

The structure of the complex in photosystem II where oxygen is evolving in a light-activated state. Water molecules are shown as blue spheres, the four manganese ions in purple, the calcium ion in green and the bridging oxygen ions in red. The blue mesh is the experimental electron density, and the blue sticks are the protein side chains holding the catalytic complex.

Credit

Johannes Messinger, Umeå University

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