THY1 and infection: In summary, after infection of hDFSCs with P. intermedia or T. forsythia (MOI = 100) no alternation in stem cell surface marker expression (positive for CD73, CD29, CD90, CD105 and CD44; negative for CD45) under anaerobic atmosphere and differentiation potential to adipogenic, chondrogenic and osteogenic fate was detected compared to uninfected cells (Fig. 3, see Supplementary Tab.