它们起先是小泡然后变成纤维管。
They start out as vesicles that then stretch into stringy tubes.
2表达主要定位于肾小管上皮细胞（尤其为近曲小管），也可见于肾毛细血管袢、间质浸润细胞和成纤维细胞。
Par-2mainly expressed in renal tubular epithelial cells especially in proximal tubular cells. it also located in renal capillary ansa interstitial infiltrate cells and fibroblast.
PAR - 2表达主要定位于肾小管上皮细胞(尤其为近曲小管)，也可见于肾毛细血管袢、间质浸润细胞和成纤维细胞。
PAR-2 mainly expressed in renal tubular epithelial cells, especially in proximal tubular cells. It also located in renal capillary ansa, interstitial infiltrate cells and fibroblast.
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