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(A) Dissociated single adherent cells were observed after culture of synovial fluid samples for 48(B) Cells were observed growing from small tissue masses after culture of synovial fluid samples for 5 days. (C) Microscopic image showing the typical morphology of synovial fluid-derived cells. (D) Immunofluorescent staining of synovial fluid-derived cells demonstrated positive expression of VCAM-1. Scale bars = 100 µm.
