Discovery of pheophytin function in the photosynthetic energy conversion as the primary electron acceptor of Photosystem II

This minireview describes the discovery of participation of pheophytin, a metal-free derivative of chlorophyll, in the early steps of photosynthetic solar energy conversion as the primary electron acceptor of Photosystem II. This revised version was published online in August 2006 with corrections to the Cover Date.