Schistosoma mansoni: the presence and ultrastructure of vitelline cells in adult males

Abstract
The presence of vitelline cells in male Schistosoma mansoni from both mixed and single sex infections in mice is described.Ultrastructurally these vitelline cells resemble the mature, Stage 4 cells from normal female worms. As yet no developing vitelline cells (Stages 1 to 3) have been found. The cells do not appear to form complete lobules as in the female.