a Hematoxylin and eosin (H&E) staining of the frog heart before resection (sham) or at 0, 1, 3, 7, 14, 30, 60, and 90 dpr. b Masson trichrome-stained sections showing early deposition of epicardial extracellular matrix at 1–14 dpr, with minimal evidence of cardiac fibrosis by day 30. c, d Quantification of regeneration at 0, 30, and 60 dpr. Ventricle weights (c) and sagittal section surface area (d) are presented as percentages of sham-operated controls. Numbers of samples analyzed are indicated within the bars. Data are presented as mean ± SEM, *p < 0.05 (Student’s t test).
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机译：在切除前（假）或在0,1,3,7,14,30,60和90 DPR之前，青蛙心脏染色的血清毒素和曙红（H＆E）染色。 B Masson三色染色部分显示在1-14 DPR处的外膜细胞外基质的早期沉积，最小的心肌纤维化证据是第30天的依据。C，D定量再生0,30和60 DPR。心室重量（c）和矢状截面表面积（d）表示为假手术控制的百分比。分析的样品数量在条内表示。数据显示为平均值±SEM，* P <0.05（学生的T测试）。
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