Growth of the bioreactor (Bior) enrichment culture under 0.1, 0.5, 1, 2.5, and 5 mM concentrations of ammonium perchlorate. Concentrations (ng/mg of total protein) of CD, PcrA, and PcrB biomarkers detected at marked time points during growth on 5 mM ammonium perchlorate are indicated. Error bars show standard deviations.