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Which of the following answers complete the sentence correctly? The pyruvate dehydrogenase complex is activated by:...

Which of the following answers complete the sentence correctly?

The pyruvate dehydrogenase complex is activated by: Select one or more:

a. decreased levels of insulin

b. phosphorylation of the pyruvate dehydrogenase component E1

c. stimulation of a specific phosphatase by Ca2+

d. decrease of the NADH/NAD+ ratio

e. inhibition of a specific kinase by pyruvate

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