1.1.1.409	3-dehydro-4-phospho-L-threonate = glycerone phosphate + CO2	
1.1.1.409	4-phospho-D-erythronate + NAD+ = 3-dehydro-4-phospho-L-threonate + NADH + H+	
1.1.1.409	4-phospho-D-erythronate + NAD+ = glycerone phosphate + CO2 + NADH + H+