Fig. 4. A longitudinal section through a T gondii organism that has recently invaded a host cell. The inset at higher magnification illustrates ribosomes (r*) attached to the endoplasmic reticulum (white arrow). (× 28,400; inset × 81,000.) n, nucleaus; Gc, Golgi's complex; m, mitochondrion; er, endoplasmic reticulum; c, conoid; r, rhoptry; rs, rhoptry sac.