a D-alpha-amino acid + O2 = a 2-iminocarboxylate + H2O2
a d-alpha-amino acid + o2 = a 2-iminocarboxylate + h2o2
a D-alpha-amino acid + O2 = a 2-iminocarboxylate + H2O2
a d-alpha-amino acid + o2 = a 2-iminocarboxylate + h2o2