The small two-part structures in cells that make proteins are called ribosomes.

Here's why:

* Two parts: Ribosomes are composed of two subunits: a large subunit and a small subunit.

* Protein synthesis: These subunits work together to translate genetic information from messenger RNA (mRNA) into a chain of amino acids, which then fold into a functional protein.

Let me know if you have any other questions about ribosomes or protein synthesis!