Woolly mouse

Woolly mouse
OrganismMus musculus
ModeGenome editing
DeveloperColossal Biosciences
Trait(s) conferred
  • Woolly coat
  • Elongated hair
  • Golden-brown fur
  • Cold tolerance
  • Curly whiskers

The woolly mouse refers to a variety of genetically modified laboratory mice developed in 2025 by Colossal Biosciences as part of efforts toward the de-extinction of the woolly mammoth. The mice feature mammoth-inspired traits which include woolly coats and other genetic modifications aimed at cold tolerance.

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