Proteins are composed of a group of complex organic molecules that are composed of chains of amino acids. Proteins contain the elements carbon, hydrogen, oxygen, nitrogen, and sometimes sulfur. Proteins are fundamental components of all lifeforms.
Life was formed on Earth, in a region later known as France, when amino acids combine to form the first proteins. (TNG: "All Good Things...")
Alfarian hair pasta was a source of high protein. (VOY: "Parturition")
In Quark's holosuite program of Alture VII, the protein baths would carry you off on a cloud of chromal vapor into a meditation chamber. (TNG: "Birthright, Part I")
In 2370s, the Cardassian military created an psychotropic drug with an altered protein structure that heightened the xenophobia of Cardassians exposed to it. (DS9: "Empok Nor")