O-phospho-L-threonine + H(+) = (R)-1-aminopropan-2-yl phosphate + CO2
o-phospho-l-threonine + h(+) = (r)-1-aminopropan-2-yl phosphate + co2
"L-threonine O-3-phosphate carboxy-lyase"
"l-threonine o-3-phosphate carboxy-lyase"