Introduction. The impaired proliferative capacity of alveolar epithelial cells after injury is an important factor causing epithelial repair dysfunction. leading to the occurrence of idiopathic pulmonary fibrosis (IPF). Alveolar type 2 (AT2) cells as the stem cells of alveolar epithelium participate in the repair process after alveolar injury. https://fitnessgravesyardes.shop/product-category/pillow-block-bearing-kit/