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flag Heart attack severity varies by time of day, linked to body's circadian rhythm, study finds.

flag Researchers have found a link between heart attack severity and the body's circadian rhythm. flag Proteins BMAL1 and HIF2A, which regulate the heart's response to low oxygen levels, target a gene called AREG, affecting the extent of heart damage. flag Heart attacks around 3 a.m. cause more damage compared to those at 3 p.m. By timing drug treatments with the body's internal clock, researchers suggest significant protection could be provided to the heart, opening new avenues for treatment.

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