Pheophytin

Pheophytins are a group of molecules that serve as electron carriers. They accept excited electrons from photosystem II and pass them to plastoquinone Q A (Figure 17.12). Pheophytins resemble chlorophyll, except that two protons substitute for the centrally bound magnesium atom.

See also: Plastoquinones, Photosystem II, Photosystem I, Plastoquinone Q H, Plastoquinone Q A, Plastoquinone Q B