Elastin in alveolar tip in lung tissue (human, adult)

Immuno-electron microscopy (embedded in Lowicryl HM 20). The amorph elastin (E) appears pale after embedding in this type of resin, but is antibody-labeled with electron-dense gold particles of 10 nm. (Col) indicate bundles of collagen fibers which are intermingled with swollen cytoplasmic extensions of myofibroblasts (F). An alveolar capillary (Cap) with an unlabelled endothelial cell (2) and a pericyte (3) is indicated. (A) indicates alveolar space and (1) is a thin alveolar epithelial cell.