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. Author manuscript; available in PMC: 2014 Nov 13.
Published in final edited form as: Chem Rev. 2013 Sep 16;113(11):8423–8455. doi: 10.1021/cr400158h

Figure 2.

Figure 2

Idealized SDS PAGE separation of the Rpb1 subunit. Increasing phosphatase treatment increases the mobility of the IIo form while proteolysis increases the mobility of both forms. x refers to intermediate phosphorylation states while y refers to intermediates in CTD degradation.