Expression of senescence associated (SA) β-galactosidase with different experimental treatments. Senescent HDFs, passage 30 (A); cells with H2O2-induced oxidative stress (B); HDFs at young age, passage 4 (C) and γ-tocotrienol-treated HDFs (D). Cells with blue staining indicated positive for β-galactosidase activity. Micrographs are shown at ×200 magnification.
Zainuddin et al. BMC Molecular Biology 2010 11:59 doi:10.1186/1471-2199-11-59