(a) UN-D
(b) AD
(c) OS
(d) CH
(e) WS
Figure 5: Ranking of stability (M values) in selected reference genes by using geNorm software. M values were analyzed from each Ct value categorizing five groups by geNorm software by calculating the average of pairwise variation between tested twelve reference genes. The left side of graph indicates high M value, which means low stability, and the right side of graph presents high stability with low M value. Each M value is presented above gene symbols. M values of twelve genes for (a) undifferentiated status of BMSCs, AMSCs, and SMSCs and (b–d) differentiated cells into adipocytes, osteocytes, and chondrocytes, respectively. (e) Whole status of MSCs.