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blue-green algae,popular name for those microorganisms that are now more properly called cyanobacteriacyanobacteria
or blue-green algae,
photosynthetic bacteria that contain chlorophyll. For many years they were classified in the plant kingdom along with algae, but discoveries made possible by the electron microscope and new biochemical techniques have shown them to be
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blue-green algae[¦blü¦grēn ′al·jē]