The discovery that a protein called CXCL5 is responsible for triggering the pain of sunburn may indicate it has a wider role in other inflammation-related conditions. This could pave the way for new drugs that have fewer side effects than current painkillers and analgesics, said UK researchers whose work is published in 6 July issue of Science Translational Medicine. There aren't many drugs that work effectively against pain that persists for hours and days, and those that do, don't always give full relief... 
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