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Expression of semaphorin-7A (sema7A), periostin, fibronectin and collagen-1 (COL1A1) were measured by real-time PCR in fibroblasts from non-fibrotic (●, n = 7) and IPF lung (■, n = 6). Semaphorin-7A expression was inversely associated with periostin expression level (rp = -0.608, p = 0.027, n = 13).
