Utilization of G2P, G3P, and phosphate (Pi) as sole phosphorus sources by individual ugp mutants. Strains were streaked on 0.4% glucose-MOPS media with the phosphorus sources indicated at a concentration of 0.5 mM. All strains are derivatives of BW14893 [Δlac(X74) ΔphoA532 Δphn33-30]. The following strains were tested (from left to right): top row, BW14893, WM5085 (ΔugpBAECQ), WM5089 (ΔugpB), and WM5087 (ΔugpE); bottom row, WM5088 (ΔugpA), WM5063 (ΔugpC), and WM5086 (ΔugpQ).