So before this reaction actually begins, that serine contains the phosphoryl group. And so when this reaction takes place, that phosphoryl group is transferred from the Serene residue onto carbon six of this glucose, forming that glucose one six bisphosphate intermediate. Now, in the next step of this process, this phosphoryl group is transferred from carbon one onto so from carbon one of the glucose 116 bisphosphate onto that Serene residue. And what that does is it regenerates the active side of this phosphoglucomutase enzyme and it forms that glucose six phosphate. So we see that glycogen breakdown. Glycogen degradation consists of three major steps and involves four major enzymes.