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Epifluorescence micrographs of microorganisms larger than 0.6 μm (10 mL filtered) in Columbia River estuary water collected at the surface of the North Channel station on May 23, 2013. A. DAPI-stained cells and B. the corresponding microscopic field using the FISH Katablepharis-specific probe. Probe hybridized to a ∼7 m organism, the approximate size of katablepharids found in other systems.
