staining of frozen sections and immunofluorescence flow cytometry showed intercellular adhesion molecule-1 ( icam-1 ) is expressed on non-hematopoietic cells such as vascular endothelial cells , thymic epithelial cells , certain other epithelial cells , and fibroblasts , and on hematopoietic cells such as tissue macrophages , mitogen-stimulated t lymphocyte blasts , and germinal center dendritic cells in tonsils , lymph nodes , and peyer 's patches .
C0282491
germinal center
C0024204
lymph nodes