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![Stem cells and tissue engineering in plastic surgery: an update](https://image.oaes.cc/e166a094-7205-4156-91b7-c007a5925434/3480.fig.2.jpg)
Figure 2. Because the chondrocytes were from porcine and the ADSCs were from human, we determined the contribution of each cell type to chondrogenesis. Hy-PYD assesses collagen crosslinking. Here, the expression of Hy-PYD was assessed from the discs by ELISA, and the 1:9 condition increased the expression over the chondrocytes alone. The 1:9 condition was significantly greater than the 1:5 condition. This indicated that ADSCs were stimulating the chondrocytes to be more chondrogenic. ADSCs: adipose derived stem cells; ELISA: enzyme-linked immunosorbent assay