Nutrient assimilation and regulation. (A) Relative abundances of proteins involved in nutrient acquisition. Non-significant observations are marked with a cross. Cultures grown in 3% Pi are indicated with a square, whilst 0.3% cultures are indicated with a triangle. Empty datum points correspond to significant observations without a Bonferonni correction applied, whereas filled points are observations with the correction. The dotted line represents parity in abundance between control and experimental cultures. (B) Levels of measured APase activity (circles) and relative abundances of PhoA within cultures grown in 3% and 0.3% Pi.