Exclusion Principle: Do Similar Sub-Atomic Particles Follow?

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Does the exclusion principle hold true only for similar sub-atomic particles?
 
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It holds only for identical fermions.
 
Alright. But then how is that proton stars are formed due to the exclusion principle repulsion between protons and neutrons and simple dwarf stars are formed due to the exclusion principle repulsion between electrons? Why these reservations? Or do special conditions prevail?
 
This means that a star with mass above the Chandreshekhar limit may either collapse into a black hole or a neutron star, depending upon the amount of pressure.
 

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