the present paper , by using interspecific chimera of chick and quail and submicroscopic study on the bursal follicle associated epithelium ( fae ) cells during differentiation , indicates that fae cells of the bursa of fabricius are formed not by differentiation of the epithelial cells but originate from the mesenchymal cells after invading the bursal anlage , and then differentiate into fae cells .
C0007589
differentiation
C0007634
cells