Alignment of primary amino acid sequences of the non-putative D-carbamoylases of Agrobacterium tumefaciens RU-OR (HyuC2; ABS11194.1), Pseudomonas sp. KNK003A (BAD00008.1), Agrobacterium radiobacter NRRL B11291 (1FO6), Agrobacterium sp. KNK712 (1ERZ) and the deduced carbamoylase sequence of Aminobacter sp.DSM24754. The dark shading symbolizes identical residues while bold letters represents similar residues. (⋆) residues identified as catalytic triad, (●) residues assumed to play a key role in substrate recognition (Chen et al. 2003; Wang et al. 2001; Nakai et al. 2000), (▴) residues supposed to influence thermal stability (Oh et al. 2002; Ikenaka et al. 1999; Chiu et al. 2006; Chiang et al. 2008), (▲) residues potentially influencing oxidative stability (Oh et al. 2002).