Stage I lactogenesis, or secretory initiation, occurs during pregnancy and is defined by the differentiation of mammary alveolar epithelial cells into specialized secretory cells, termed lactocytes (1). (academic.oup.com)
Calcitonin Gene - Related Peptide Enhances the Expression of Signaling Molecules of the Wnt 7b / Beta - Catenin Pathway in Rat Type II Alveolar Epithelial Cells Under Hyperoxia Hyperoxic lung injury is characterized by epithelial cell death and leukocyte infiltration / inflammation in the lung. (thecmmr.org)
In the first half of pregnancy secretory differentiation (the differentiation of alveolar epithelial cells into milk - secreting cells), ductal branching and lobular formation of the breast (mammogenesis) occur. (medela.com)