Metabolism of 2-hydroxybenzoate by S. aciditrophicus in pure culture with crototate as the cosubstrate (A) and in coculture with M. hungatei (B). The data are averages ± standard deviations (error bars) of triplicate cultures. Symbols: •, 2-hydroxybenzoate; ○, crotonate; ▴, cyclohexane carboxylate; ▪, acetate; □, benzoate; ⧫, methane.