1.7.6.1 ? x * 20600, calculated from sequence 714157 1.7.6.1 ? x * 20966, MALDI-TOF-MS 716826 1.7.6.1 ? x * 20969, calculated from sequence 716826 1.7.6.1 additional information enzyme tends to form oligomers and precipitates at higher concentration. At concentrations of approximately 0.1-2 mM oligomers are in equilibrium with monomers. The protein oligomerizes preferably in units of trimers, hexamers, and higher oligomeric states of unidentified composition 724394