Burmese head defect (BHD)
A severe skull and facial malformation carried from the breed's Burmese ancestry. Kittens with two copies of the mutation are stillborn or die shortly after birth and require euthanasia; one copy causes no defect but can produce a slightly shortened face.
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Burmese head defect (ALX1) DNA test on both parents, showing an N/N (clear) result

