There isn't a single "cell of mucus." Mucus is produced by specialized cells called goblet cells.

Here's why:

* Mucus is a substance, not a cell. It's a sticky, gel-like fluid that helps protect and lubricate various surfaces in the body.

* Goblet cells are a type of epithelial cell found in the lining of various organs, like the respiratory tract, digestive tract, and reproductive tract.

* Goblet cells are responsible for secreting mucus into the surrounding environment. They have a distinctive shape, resembling a goblet or wine glass, with a wide base and a narrow neck containing the mucus.

So, while mucus is a product, goblet cells are the specific cells that produce it.