1.14.99.53 lytic chitin monooxygenase chitin degradation III (Serratia) - - 3.2.1.14 chitinase chitin degradation III (Serratia) - - 3.2.1.52 beta-N-acetylhexosaminidase chitin degradation III (Serratia) - - 3.2.1.200 exo-chitinase (non-reducing end) chitin degradation III (Serratia) - - 3.2.1.201 exo-chitinase (reducing end) chitin degradation III (Serratia) - -