They carry out unique redox chemistry. On absorbing light, PSII produces a very high oxidizing potential (about +1.2 Volts) sufficient to split water into its elemental constituents. In fact it is ...

Cyanobacteria began contributing oxygen to Earth's mostly noxious atmosphere more than 2 billion years ago. The photosystem II protein complex now shared by various lineages of cyanobacteria, algae ...