Assertion: epidermis's cell | /r/HasProperty | part of the immune system
Facets:
Source sentences:
text: The hypodermis contains the cells known as fibroblasts, adipose tissue (fat cells), connective tissue, larger nerves and blood vessels, and macrophages, cells which are part of the immune system and help keep your body free of intruders.
text: These cells are a part of the immune system and scavenge on viruses and bacteria to keep the skin safe from infections.