staining of chicken bursas with different monoclonal antibodies reacting either with the epithelial component ( bep-1 ) or with the hemopoietic cells of the bursa ( l22 , l17 ) confirmed that hemopoietic cells , presumably macrophages , are mixed with the epithelial cells at the level of fae .
C0014597
epithelial cells
C0014609
fae