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Finally, they asked a colleague who specializes in bone disorders which of those are known to cause osteopetrosis.

Nobody had ever described this type of genetic osteopetrosis in cats, but there are very similar mutations in the same gene in mice and in humans that also cause osteopetrosis.

Bub has osteopetrosis, a condition that causes her bones to be denser than they should be — it may also contribute to her odd facial expression.

The drug was approved for treatment of chronic granulomatous and malignant osteopetrosis, which are genetic disorders.

Which means that Lil Bub, viral Internet cat, could help doctors better treat human patients whose osteopetrosis stems from the same gene mutation.