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Jeff Williams collects a breath sample for MARROW

2016-05-23 - NASA astronaut Jeff Williams collects a breath sample for the Canadian experiment MARROW in his crew quarters on board the International Space Station. MARROW studies how a lack of physical activity affects the bone marrow production of normally functioning blood cells. By measuring carbon monoxide levels in breath samples, researchers monitor the degradation of red blood cells. The results may also improve the rehabilitation of bedridden patients, those with reduced mobility, and seniors on Earth. (Credit: NASA)

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Photo taken on May 23, 2016

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