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A critical member of this network is cyclic adenosine monophosphate (cAMP) response element-binding protein (CREB), which is phosphorylated in response to adrenergic signaling (e.g., exercise, cold) and binds directly to the cAMP response element (CRE) in the PGC-1 promoter to initiate transcription

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Water is at its densest at about 4C, not at freezing point

Importantly, serum B12 levels can be misleadingly normal or even elevated in chronic liver disease due to increased levels of binding proteins (such as haptocorrin) and reduced clearance, meaning that total B12 measurements may not accurately reflect tissue B12 status or functional deficiency

2 B12 deficiency can be due to inadequate dietary intake, in particular in people following a strict vegan diet (B12 is only found in animal foods)