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PFGE analysis of microalgal cultures, showing the appearance of an approximately 60-kb band 8 weeks after addition of viral concentrates. Lanes A and G, viral concentrates; lanes B, D, E, and F, cultures to which concentrate from lane A was added; lanes H and I, cultures to which concentrate from lane G was added; lanes C and J, control cultures to which no viral concentrate was added. Molecular size markers are λ concatemer ladders.
