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Figure 6 Histology: Movat pentachrome staining (A,C,E) and immunohistochemical staining for semiquantitative assessment of fibronectin expression (B,D,F) in one normal term ductus arteriosus (A,B), DAA ressected (one at 10 weeks [C,D] and the other at 3 days of age [E,F]). DAA = ductus arteriosus aneurysm; IC = intimal cushions, IEL = internal elastic laminae.