[未知题]前弹力层是胚胎期由基质浅层______分泌形成，损伤后______，后弹力层由______分泌形成，损伤后______。

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• ●    原肠胚期是胚胎的三个胚层开始形成的时期,三个胚层形成动物的各种组织结构:脑由(____)发育而成,心脏由(____)形成,肝
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• ●    _______________will not continue if an ongoing operation i changed or deletedA、
• ●    前弹力层是胚胎期由基质浅层______分泌形成，损伤后______，后弹力层由______分泌形成，损伤后______。
• ●    增生性玻璃体视网膜病变(PVR)的基本病例过程是：________在炎性因子等刺激下，从裂孔内游离、________、________并有表型转化，如变为成纤维细胞样细胞，分泌胶原，在玻璃体内和视网膜前、后表面形成增生性膜。