Figure 4From: Long-term cultivation of colorectal carcinoma cells with anti-cancer drugs induces drug resistance and telomere elongation: an in vitrostudyEffect of the long-term cultivation with anti-cancer drugs on the expression of drug resistance genes. An RT-PCR analysis of the MRP and mdr-1 genes was performed by using the cells at each PDL. The G3PDH gene was used as an internal control.Back to article page