All of the following statements apply to skeletal muscle glycogen phosphorylase EXCEPT which one?
A) Phosphate ion is one substrate of this enzyme.
B) Its activity is increased by high levels of AMP.
C) The fully functional enzyme has more than one active site.
D) The b form contains a phosphorylated serine group.
E) The activity of the liver enzyme is influenced by levels of epinephrine.
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