label: reduced [flavodoxin] + L-arginine + O2 = N(omega)-hydroxy-L-arginine + oxidized [flavodoxin] + H2O + H(+)
label_lc: reduced [flavodoxin] + l-arginine + o2 = n(omega)-hydroxy-l-arginine + oxidized [flavodoxin] + h2o + h(+)