D-galactose 6-phosphate + beta-D-glucose => lactose 6-phosphate + H2O
d-galactose 6-phosphate + beta-d-glucose => lactose 6-phosphate + h2o
D-galactose 6-phosphate + beta-D-glucose => lactose 6-phosphate + H2O
d-galactose 6-phosphate + beta-d-glucose => lactose 6-phosphate + h2o