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RNA isolated from nine different patient-derived normal lung fibroblast lines and 13 different IPF fibroblast lines was reverse transcribed and examined by quantitative real-time PCR for (A) X-linked inhibitor of apoptosis (XIAP), (B) baculoviral inhibitor of apoptosis repeat–containing (BIRC)2, and (C) BIRC3. Each sample was run in triplicate and indexed to the average expression level in the normal lung fibroblasts. *P = 0.025 compared with normal lung fibroblasts.
