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Detection of Archaea (probe ARCH915) by CARD-FISH at different cell permeabilization procedures and formamide concentrations in Lake Redon. The boxes represent the median and the 25 and 75% percentiles. The bars indicate the 10 and 90% percentiles. Different letters above each box indicate treatments that differed significantly (P < 0.05, n = 50). Abbreviations: K, K permeabilization; LA, LA permeabilization (see the text).
