Growth, mannitol consumption, and product formation by L. lactis NZ9000 (A) and NZ9010/pNZ-mtlD (B) cultured under anaerobic conditions. M17 broth supplemented with 75 mM mannitol was inoculated with 2% (vol/vol) glucose-grown overnight culture. ▪, mannitol; ⧫, lactate; ▴, ethanol; ○, formate; □, acetate; •, OD600.