Telomere length analysis of ChDPSC-1 and ChDPSC-2. Telomere length of ChDPSCs was measured by using the TeloTAGGG Telomere Length Assay kit from Roche Applied Science. Cell samples were collected at every five passages until passage 15 as described in the proliferation study. A reduced telomere length was observed in both ChDPSC lines as the number of passage increase. Left panel: ChDPSC-1; Right panel: ChDPSC-2.