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Unicellular , probably similar to those reported by Zehr and other as nitrogen fixing (Zehr, J. P., Waterbury, J. B., Turner, P. J., Montoya, J. P., Omoregie, E., Steward, G. F., Hansen, A. & Karl, D. M. 2001. Unicellular fix N2 in the subtropical North Pacific Ocean. Nature 412:635-638). BIOSOPE cruise (South East Pacific oct-dec 2004) Station STB2 depth 30 m. stained sample observed by under UV light.
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