I imagine it would be very possible in the future to see new mutations. Does anyone have a timeline on how long champagne and pearl and cream have been around? It seems unlikely they all appeared at once, as is likely evidenced in the fact some are so much more rare than others.
I don't know much about "mushroom" but that is likely a good example an unknown and not understood mutation as the horses appear silver but are genetically testing positive for red?
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