Relative abundances of proteins involved in (A) central metabolic processes, and (B) biosynthesis. 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.