Menu
Home
People
Places
Arts
History
Plants & Animals
Science
Life & Culture
Technology
Reference.org
Index of protein-related articles
open-in-new
<p><a href="/facts/Protein/Jxmagu3E">Proteins</a> are a class of biomolecules composed of <a href="/facts/Amino_acid/WDxYwBny">amino acid</a> chains. </p>