THY1 and Alzheimer disease: There were no significant differences in the levels of marker expression between BM-MSCs and AD-MSCs: CD29 (99.62 ± 0.19 vs. 99.88 ± 0.10), CD90 (99.34 ± 0.85 vs. 98.17 ± 2.31), and CD45 (0.36 ± 0.12 vs. 0.41 ± 0.29) (Figure 3C).