Neutrons are (primarily) UDD while protons are (primarily) UUD. Although I do wonder if this charm+anticharm ghost exists in other hadrons
Yes, this is correct.
> Although I do wonder if this charm+anticharm ghost exists in other hadrons
Yes, neutrons and all the other hadrons have virtual pairs of char-anticharm quarks. (And some of them have actual charm or anticharm quarks.)
Neutrons are (primarily) UDD while protons are (primarily) UUD. Although I do wonder if this charm+anticharm ghost exists in other hadrons