When we think of the composition of a proton we often think of three quarks and some gluons that mediate the force among them. The reality though is kinda different and it even depends on the energy scale at which you look at the proton. What you will find out is that the proton is not made of just two u and one d quarks but it is made of all the quarks. Quarks of different flavour have different probability density of carrying certain fraction of the proton's total 4-momenta which is captured by the parton distribution functions mentioned in this video
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