beta-D-glucose 1-phosphate + D-glucose => alpha,alpha-trehalose + phosphate
beta-d-glucose 1-phosphate + d-glucose => alpha,alpha-trehalose + phosphate
beta-D-glucose 1-phosphate + D-glucose => alpha,alpha-trehalose + phosphate
beta-d-glucose 1-phosphate + d-glucose => alpha,alpha-trehalose + phosphate