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Fig. 2
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Leukocyte concentrations in healthy volunteers (HV) (A), and knee osteoarthritis (KOA) patients (B). Data are presented as the mean ± SD (**p < 0.01, *p < 0.05). PPP, platelet-poor plasma; LP-PRP, leukocyte-poor platelet-rich plasma; APS, autologous protein solution.