Photosynthesis Cyanobacteria . The blue-green algae, or cyanobacteria, are an important group of prokaryote photosynthesizers. They use the same pigment, chlorophyll a , as the green plants and have similar carotenoids, but in addition have accessory pigments called phycobilins . One of these is blue, phycocyanin (the source of the group name), the other a dark red,
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