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Morphology of AT-MSCs from one representative donor at early passage (P5), moderate passage (P10), and late passage (P15). A: P5 FFP; B: P10 FFP; C: P15 FFP; D: P5 non-FFP; E: P10 non-FFP; F: P15 non-FFP. Magnification: 100×. FFP: fresh frozen plasma; Non FFP: non-fresh frozen plasma
