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Growth parameters for Attheya grown at 200, 370 and 670 p.p.m. pCO2 in B12-replete (open bars) and B12-limited cultures (filled bars). (a) Specific growth rates (per day) and (b) 14C-based primary productivity (μg C per μg chl per h). Error bars represent one s.d. (n=3).
