Prokaryotes vs. Eukaryotes
Picoplankton observed by epifluorescence microscopy, a technique which allows the detection of certain groups of cells possessing fluorescent pigments; and example would be Synechococcus, which possess phycoerythrin
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"Picoplancton fluorescence Pacific."
http://en.wikipedia.org/wiki/File:Picoplancton_fluorescence_Pacific.jpg
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