Which statement accurately compares the liver and muscle isozymes of glycogen phosphorylase?

• A. Both isozymes are expressed in the same tissues.
• B. Both isozymes are regulated by the same allosteric effectors.
• C. Both isozymes are catalytically similar but differ in their allosteric regulation.
• D. Both isozymes are structurally different and catalytically different.

Answer: (C)