Caption: Spirulina algae. Light micrograph of a single strand of Spirulina platensis, a type of cyanobacteria or blue green algae. The strand consists of many individual cells joined together. Cyanobacteria are primitive, prokaryotic organisms which have their nuclear material dispersed throughout the cell. They make their food by photosynthesis in primitive, thread-like structures called lamellae. Some Spirulina species are eaten as a protein-rich health food. Differential contrast image. Magnification: x160 at 35mm size.
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