* Proteins are found in BOTH animal and plant cells. They are essential building blocks for all living things.

Let's break it down:

* Proteins are made of amino acids. Both animal and plant cells have the machinery to create these amino acids and assemble them into proteins.

* Proteins have diverse functions. They act as enzymes, hormones, structural components, and more, in both types of cells.

So, while proteins are found in both animal and plant cells, they are not specific to either one.