Table 1. Flow cytometry analysis of surface antigens in young and aged macaque BMSCs ($\overline{X}\pm \text{s}$).

Surface antigens	Groups	Positive cell rate(%)	P-value
CD29	Young cell group	100.00 ± 0.00	0.423
	Aged cell group	99.97 ± 0.06
CD105	Young cell group	99.83 ± 0.06	0.057
	Aged cell group	99.97 ± 0.06
CD73	Young cell group	99.97 ± 0.06	0.329
	Aged cell group	98.60 ± 1.85
CD184	Young cell group	96.83 ± 2.85	0.409
	Aged cell group	88.2 ± 15.96
CD90	Young cell group	99.43 ± 0.45	0.017
	Aged cell group*	24.37 ± 17.35
CD45	Young cell group	0.17 ± 0.12	0.097
	Aged cell group	3.47 ± 2.65
HLA-DR	Young cell group	0.33 ± 0.23	0.066
	Aged cell group	4.53 ± 2.89

Note: *P < 0.05 compared with the young cell group (n=3).