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Developmental onset of mesothelial defects in Wt1−/− hearts. Histological analysis by haematoxylin and eosin staining of PPM development was carried out on transverse sections of the posterior venous pole region of E12.5 to E14.5 wildtype and Wt1−/− hearts as indicated. li, liver; other abbreviations are as in Figures 1 and 2.
