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In vitro expansion kinetics of MSC isolated from sternum of ischemic (IHD) and non-ischemic valvular heart disease (VHD). a, c Average cumulative population doubling (CPD) and cumulative days in each passage of IHD and VHD samples. a, b From P1 to P3. c, d From P4. Sample size (n) is shown in Fig. 5
