Potential answers for "Part of a neutron's makeup"

⭐⭐⭐⭐ DOWNQUARK
⭐⭐ LINES
⭐⭐ PULSARS
⭐⭐ RADIATIONSOURCE
⭐⭐ PULSAR
⭐⭐ LINER
⭐⭐ BETADECAY
⭐⭐ RETINA
⭐⭐ ATOM

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