Transmission electron micrograph (TEM) of the algae species Cyanophora paradoxa, section of cyanelle (chloroplast), showing thylakoids and general prokaryotic organization. Cyanophora paradoxa is a colorless cryptomonad flagellate that has a permanent cyanobacterial endosymbiont; flagellate swims toward the light so that the cyanelle can photosynthesize to provide food for itself and the host. Magnification: 30,000X at 5.5 x 7.5" print size.