The researchers speculate that HDL's anti-inflammatory properties may explain the finding, but say further research is needed to tease out the specific cause.
They found the caffeine in coffee and the anti-inflammatory ingredients of aspirin and other painkillers reacted against the chemical compounds of ethanol, or pure alcohol.
For one patient, this was the first time he had seen anything in half a century, after his sight was destroyed by retinitis pigmentosa, a virus that attacks retinal cells.
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