New drug testing method looks for biological changes that could be indications of doping.

"What has happened has been described … as almost an arms race between the potential [for doping] and the techniques for the detection of doping," Barton said.

Whereas small molecule-based methods for detecting steroids look for the presence of the drugs themselves either in urine or blood, a biomarker-based strategy, such as that being developed by Quotient Bioresearch, identifies biological changes that suggest steroid use."

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