Blastocystis hominis stages were reproduced from Singh M, Suresh K, Ho LC, Ng GC, Yap EH. Elucidation of the life cycle of the intestinal protozoan Blastocystis hominis. Parasitol Res 1995;81:449. Copyright held by Springer-Verlag and reproduced here by permission of Springer-Verlag and M. Singh.