What a peptide is

A peptide is a short chain of amino acids. A protein is a long one. Your body already makes both. Insulin is a peptide. So is GLP-1.

The chain binds to a receptor on a cell. Then the cell does something: take sugar in, say you’re full, start a repair process.

Research vials are copies of those chains. Isolated so one thing can be studied. The list · The landing