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Now, this is the gene that was meant to be named “hairy” instead of this one:
Hirsute-s You, Sir! Could Super Furry Animals Provide Clues For Baldness?:

The team found that cells given the genetic command to become hair follicles will send out signals to neighbouring cells to prevent them from doing likewise, so producing a specific hair pattern.

They also demonstrated that by hyperactivating the ‘hair protein’ in embryonic mice, young with considerably more fur than normal were produced.