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The gene expression analysis of type I collagen (COL I), type II collagen (COL II), SRY-box transcription factor 9 (SOX 9), and aggrecan (ACAN) by quantitative real-time polymerase chain reaction (qRT-PCR) after culture chondrocytes in HPN or on TCPS for 14 days (A) and 28 days (B). * p < 0.05 compared with TCPS.
