In enzymology, a cellobiose phosphorylase is an enzyme that catalyzes the chemical reaction cellobiose + phosphate ⇌ {\displaystyle \rightleftharpoons } alpha-D-glucose 1-phosphate + D-glucoseThus, the two substrates of this enzyme are cellobiose and phosphate, whereas its two products are alpha-D-glucose 1-phosphate and D-glucose. Wikipedia