[The final stage of division of the intermediate cell in a Sarcocystis muris muscle cyst].

At least two functions of the micropore, one of the zoite's apical organelles, have been established on examining S. muris intermediate cells. The micropore is known to function primarily as an ultracytostome for taking up the food. The newly discovered function of the micropore appears to be involved in the final step of daughter cell separation in dividing intermediate cell. The micropores seem to be the sites where daughter cells find their exit from the mother cell. In addition, the pattern of the daughter cell pellicle formation was followed.