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The abundance of putative Chlorovirus (a) and Prasinovirus (b and c) polB gene fragments from September 2007 to November 2009. The prasinoviruses are split into two panels based on their maximum abundances (b: low abundance=maximum abundances <1000 copies ml−1; and c: high abundance=maximum abundance >1000 copies ml−1). Error bars represent s.d. from triplicate qPCR reactions.
