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Morphologies of Arctic UCYN-A symbioses are indistinguishable from subtropical strains. Double CARD-FISH comparison of UCYN-A lineages from the Bering Sea (A and C) and water collected at the Scripps Institute of Oceanography Pier in La Jolla, CA (B and D) show similar sizes and morphologies. CARD-FISH images show the symbiosis is intact, with both the haptophyte host (green and blue) and cyanobacteria (red). (Scale bar, 5 µm.)
