Escherichia coli (E. coli) is a well-known example of a prokaryote that lives in the human body. It's a bacterium, and most strains are harmless and even beneficial, playing a role in digestion. However, some strains can cause illness.

Here are some other examples of prokaryotes found in the human body:

* Lactobacillus: Found in the gut, they help with digestion and can produce beneficial substances like lactic acid.

* Bifidobacterium: Another gut resident, these bacteria are often used in probiotics for their positive effects on digestive health.

* Staphylococcus epidermidis: This bacterium commonly lives on the skin and is usually harmless.

* Propionibacterium acnes: This bacterium contributes to acne breakouts.

It's important to note that while many prokaryotes live in our bodies and are beneficial, some can cause disease.