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Leucine assimilation rates for Prochlorococcus (A and B) or Synechococcus (C and D) and prokaryotes other than cyanobacteria (Other prokaryotes). Cell samples were taken from depths corresponding to the 30% light level and incubated in the dark (B and D) or at 30% of surface light irradiance (A and C) with 20 nM [3H]leucine. Error bars indicate standard errors of three measurements.
