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TEM images of OP3 LiM cells obtained from the second density gradient (A) (the small particles are colloidal silica particles 15 to 30 nm in diameter originating from Percoll) and in the limonene enrichment culture as free-living cells (B) or attached to other cells (C and D). Bars, 100 nm (A), 200 nm (B) and 500 nm (C and D).
