Light into the darkness of photosynthesis: 3D insights into the copying machine of chloroplasts
• A molecular 3D snapshot of the copying machine in chloroplasts, the RNA polymerase PEP, provides new insights into the evolution and function of plant photosynthesis. • Using a cryo-electron microscope, a high-resolution image of a 19-subunit PEP complex from white mustard (Sinapis alba) was taken. • Evolutionary analyses indicate