Potential answers for "One of two in a proton"

⭐⭐⭐⭐ UPQUARK
⭐⭐⭐ ISOTONE
⭐⭐ ATOM
⭐⭐ PARTICLE
⭐⭐ ANTI
⭐⭐ ADAGE
⭐⭐ CERTS
⭐⭐ OBAMA

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