From Pseudomonas species Lyophilized powderActivity: 3-5 u/mg solid Contains approx. 40% of stabilizersUnit Definition: One unit will oxidize one micromole of protocatechuate to 3-carboxy-cis, cis-muconate per minute at pH 7.5 at 37<144>C. Ref.: H. Fujisawa and O. Hayaishi, J. Biol., 243: 2673 (1968).