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Structure of matter, illustration
Structure of matter. Illustration showing how objects, such as a leaf (left) are composed of molecules (second from left), which are made up of atoms (centre). Each atom has an atomic nucleus (second from right) that is composed of protons (purple) and neutrons (green). Each proton is made up of two up (red) and one down (blue) quark and each neutron is made up of two down and one up quark., by GREGOIRE CIRADE/SCIENCE PHOTO LIBRARY
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