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Percent change in immunoreactive urinary oxytocin metabolite (iuOTM) levels of four human urine samples after storage as sample at either −20°C or −80°C or as ethanol (EtOH) extract for 2 weeks (corrected for QC), 4 weeks, 12 weeks and 6 months. The horizontal line indicates the 100% control iuOTM levels (i.e. zero change).
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