immunohistochemically , chlamydial antigen granules were present in the cytoplasm of epithelial cells of the respiratory system , hepatocytes , macrophages in the air sac , lung , serous membrane , liver , spleen , aortae , reticuloendothelial cells in the spleen , and mesothelial cells in various organs or tissues .
C0035237
respiratory system
C0024109
lung