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SDS-PAGE (13.5%) of the soluble protein fraction (20 to 30 μg protein) of cells grown on different aromatic substrates. Lane a, benzoate-grown cells; lane b, 4-hydroxybenzoate-grown cells; lane c, 3-hydroxybenzoate-grown cells; lane d, protocatechuate-grown cells; lane e, catechol-grown cells; lane f, phenol-grown cells.
