Figure 2From: X-radiation inhibits histone deacetylase 1 and 2, upregulates Axin expression and induces apoptosis in non-small cell lung cancerCorrelation between HDAC1 and HDAC2 and apoptosis in NSCLC tissues . Case 1 (A–C), positive for expression of HDAC1 and HDAC2 but low apoptotic index. Case 2 (D–F), negative for expression of HDAC1 and HDAC2 and high apoptotic index. Immunohistochemical streptavidin–peroxidase method and TUNEL, magnification × 200.Back to article page