GAPDH and idiopathic pulmonary fibrosis: As predicted, and consistent with Fig. 6, we observed a significant induction of apoptosis in cells treated with the combination of anti-FasL and Cycloheximide (+/+), as indicated by the level of cleaved PARP (89/116 kDa) expression relative to GAPDH after 6 hours of treatment (Fig. 7 panels a and b, normal ΦsiRNA (+/+) vs. normal ΦsiRNA (−/−) p < 0.0003, normal siRNA-PG (+/+) vs. normal siRNA-PG (−/−), p < 0.0002, IPF ΦsiRNA (+/+) vs. IPF ΦsiRNA (−/−) and IPF siRNA, p < 0.01, respectively).