Fig 2: Cartilage and meniscus primary cultured cell expression with the COL1A1, COL2A1 and ACAN gene expression of passage 2 meniscus cultured cells is presented in comparison with the passage 2 chondrocyte culture. The middle meniscus cells had the lowest COL1A1 expression, whereas the expression in the other three groups was not significantly different. The COL2A2 and ACAN expressions were lower in the meniscus cells compared to the chondrocyte. Among the meniscus cells, the inner and middle meniscus had higher COL2A2 and ACAN expressions compared with those from the outer meniscus. The inner and middle meniscus had no significant differences of gene expression. *: p-value < 0.05.