escherichia coli kg980 , a vitamin b6 auxotroph derived from wild strain k12 , concentrated exogenous pyridoxal in an energy-dependent manner , and the effects of energy sources and inhibitors on pyridoxal uptake , compared with those on proline uptake indicated that the energy required was in the form of phosphate bonds and not of membrane potential .
C0087162
vitamin b6
C0034263
pyridoxal