Fig. 1

Expression of p16 and NANOG in ST. a IHC detection of p16 and NANOG in normal, OA and RA ST (Bar 50 μm). b Density of p16(+) and NANOG(+) cells in the different groups (*ANOVA). c Density of p16(+) and NANOG(+) cells in normal and RA ST stratified by age: under (< 40) and over (> 40) 40 years old (*Mann-Whitney)