Figure 1From: Few amino acid positions in rpoB are associated with most of the rifampin resistance in Mycobacterium tuberculosisCross-validated pruned regression tree for minimum inhibitory concentration (MIC) of rifampin ( μg/ml ) based on amino acid sequence data from positions 511–533 of the β subunit of RNA polymerase of Mycobacterium tuberculosis . The number of observations (n) and the mean MIC values across observations () are given for each node. Split definitions are depicted with amino acid positions represented by numerals and amino acids represented by single letter code adjacent branches.Back to article page