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****: p < .00005. PPV: positive predictive value. (a)The number of reads was significantly higher for cultured than for not-yet-cultured species (bilateral Mann-Whitney test). Medians and interquartile ranges are shown. (b) ROC curve between culturability (cultured versus not-yet-cultured species) and abundance (total number of reads). (c) Linear regression of the culturability (positive predictive value to be “cultured”) versus the log10 of the total number of reads
