S Locus
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- S or Ssⁱ = No White or Residual White
sⁱsⁱ = True Irish [Seen in Breed/s: Border Collie, Bernese Mountain Dog, Australian Shepherd]
Ssᵖ = Pseudo Irish
sⁱsᵖ = Flashy Irish [Seen in Breed/s: Sheltie, Mixed Breeds]
sᵖsᵖ = Piebald or Extreme Piebald
[Theoretical]
sᵖsʷ = Extreme Piebald
sʷsʷ = Pure White
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