L-proline + formaldehyde + NADH + H(+) => N-methyl-L-proline + NAD(+) + H2O
l-proline + formaldehyde + nadh + h(+) => n-methyl-l-proline + nad(+) + h2o
L-proline + formaldehyde + NADH + H(+) => N-methyl-L-proline + NAD(+) + H2O
l-proline + formaldehyde + nadh + h(+) => n-methyl-l-proline + nad(+) + h2o