From what I'd read, the "fearless" mouse's genes suppress the development of cells in the nose. If so, it sounds like the mouse isn't detecting that the furry object is a cat, not that its fear was suppressed.

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Todd (Bowie, MD, US, North America, Earth, Sol System, Vega region, Local Bubble, Orion arm, Milky Way Galaxy, Local Group, Virgo A Cluster, Virgo supercluster, the universe in which spock is clean shaven)

Quidquid latine dictum sit, altum sonatur.

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