The relative DNA content of hASCs cultured in BM or OM, non-stimulated or stimulated with 50 or 100 Hz vibration loading at the 1, 7 and 14 day time points. Results are expressed as mean + s.d. and normalized relative to control culture (BM). *p < 0.05 for the effect of OM versus BM. White bars, BM; bars with squares, BM 50 Hz; bars with cross lines, BM 100 Hz; light grey bars, OM; dark grey bars, OM 50 Hz; black bars, OM 100 Hz.