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The following is a cause/relationship question, which includes two statements - an assertion and a reason.
You must establish whether each individual statement of the pair is true or false, and then determine whether there is a relationship between the two, ie. does the reason (the second statement) provide an explanation for the assertion (first statement)?
Under physiological conditions, intracellular levels of adenosine are kept low
BECAUSE
Adenosine metabolism is tightly regulated by HIF-1α under physiological conditions