Average and median of the total concentration of soluble proteins, aggrecan, and the ratio of the aggrecan to soluble proteins of the microspheroids from different sources of mesenchymal stem cells. A: Mean concentration (×), median (-), and standard deviation of the concentration of soluble proteins present in microspheroids extracted from samples of synovial fluid-derived mesenchymal stem cells (SF-MSCs), bone marrow-derived mesenchymal stem cells (BM-MSCs), and adipose tissue-derived mesenchymal stem cells (AT-MSCs). 1 outlier; aP < 0.05 indicates the statistical difference in relation to BM-MSCs and SF-MSCs; B: Mean concentration (×), median (-), and standard deviation of the concentration of aggrecan from the microspheroids extracted from the samples of SF-MSCs, BM-MSCs, and AT-MSCs. 1 outlier; aP < 0.05 indicates the statistical difference in relation to BM-MSCs and SF-MSCs; C: Mean concentration (×), median (-), and standard deviation of the ratio of the concentration of aggrecan to soluble proteins of the microspheroids extracted from the samples of SF-MSCs, BM-MSCs, and AT-MSCs. 1 outlier; aP < 0.05 indicates the statistical difference in relation to BM-MSCs. SF-MSCs: Synovial fluid-derived mesenchymal stem cells; BM-MSCs: Bone marrow-derived mesenchymal stem cells; AT-MSCs: Adipose tissue-derived mesenchymal stem cells.