|Description:||This illustration of a composite photomicrograph reveals the ultrastructural details seen in two stages of the life cycle of the parasite Entamoeba histolytica, the cystic stage (lt), stained with iodine, and the Giemsa-stained vegetative, trophozoite stage (cntr and rt).|
At left, you’ll see an E. histolytica cyst containing a chromatoid body, and the characteristic four nuclei, each containing a single, centrally-located karyosome. In the center, and at right, there are two E. histolytica trophozoites, otherwise known as the vegetative stage of the life cycle. Within each trophozoite, you can see a single nucleus, which contains a single, centrally-located karyosome, and peripherally-located chromatin. Note the ingested red blood cells inside each of the trophozoites.