sn-glycerol 3-phosphate + L-serine + H(+) => sn-glycero-3-phospho-L-serine + H2O
sn-glycerol 3-phosphate + l-serine + h(+) => sn-glycero-3-phospho-l-serine + h2o
sn-glycerol 3-phosphate + L-serine + H(+) => sn-glycero-3-phospho-L-serine + H2O
sn-glycerol 3-phosphate + l-serine + h(+) => sn-glycero-3-phospho-l-serine + h2o