| Alveolar Type I | AGER | AGER (HPA) | Thin cells for gas exchange |  |
| Alveolar Type II | SFTPC | SFTPC (HPA) | Surfactant production |  |
| Ciliated Epithelial | TUBB4B | TUBB4B (HPA) | Mucociliary clearance |  |
| Club (Clara) Cells | SCGB1A1 | SCGB1A1 (HPA) | Detoxifying secretory cells | No image available |
| Basal Cells | KRT5 | KRT5 (HPA) | Stem/progenitor function |  |
| Endothelial Cells | PECAM1 (CD31) | PECAM1 (HPA) | Blood vessels |  |
| Lymphatic Endothelial | LYVE1 | LYVE1 (HPA) | Lymphatic vessels |  |
| Fibroblasts | PDGFRA | PDGFRA (HPA) | Structural support |  |
| Smooth Muscle Cells | ACTA2 | ACTA2 (HPA) | Airway and vascular tone |  |
| Pericytes | PDGFRB | PDGFRB (HPA) | Vessel support/stabilization |  |
| Alveolar Macrophages | CD68 | CD68 (HPA) | Immune surveillance |  |
| Interstitial Macrophages | CD163 | CD163 (HPA) | Tissue-resident immune cells |  |
| Dendritic Cells | CD1C | CD1C (HPA) | Antigen presentation |  |
| T Cells | CD3D | CD3D (HPA) | Adaptive immunity |  |
| B Cells | CD19 | CD19 (HPA) | Antibody-producing precursors |  |
| Plasma Cells | SDC1 (CD138) | SDC1 (HPA) | Antibody secretion |  |
| Neutrophils | MPO | MPO (HPA) | Acute inflammation |  |
| Mast Cells | TPSAB1 | TPSAB1 (HPA) | Allergy and inflammation |  |
| Neurons | TUBB3 | TUBB3 (HPA) | Rare in lung; mostly autonomic |  |
| Mesothelial Cells | MSLN | MSLN (HPA) | Line the pleura |  |