sentence: Protons are known as baryons, which means that they are made of exactly three quarks.
sentences_before: Simple particles like protons are actually composites of multiple quarks.
sentences_after: Baryons are in a family called Hadrons, which simply means that they are made of quarks. The only other subcategory of Hadrons is Mesons, which are made of one quark and one antiquark.
concept_name: proton
headings: Composite particle
categories: Subatomic particles