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(A and B) Concentrations of intracellular ATP (iATP) and extracellular ATP (eATP) (both n = 3) (A) and PLFAs (B) in Atacama Desert soils. A decrease in the number of identified PLFAs indicates a decrease in diversity, which is related to increasing aridity. (C and D) Average cell-based ATP concentrations were obtained by relating iATP concentrations (C) to total biomass levels (D) measured at specific locations, which were obtained from PLFA analysis.
