Fig. 1
From: Examining the role of ABC lipid transporters in pulmonary lipid homeostasis and inflammation
ABC transporters expressed in various cell types of the alveolus. Three ABC transporters, namely ABCA1, ABCG1 and ABCA3, are expressed in lung cells present in the alveolus, notably the alveolar epithelial type I and II cells (ATI and ATII respectively) that line the alveoli or air sacs, and alveolar macrophages that are phagocytes of the pulmonary immune system. LB – lamellar bodies, where ABCA3 contributes lipids that eventually are secreted as surfactants (represented via the black arrow)