ANIMAL FACTORY

The Economist

TO A mouse — wee, sleek, cowering, timorous beast that it is – – the departure from Jackson Lab must be a bit bewildering. But a laboratory elsewhere wants to get its hands on a mouse with mutations in its Ghrhr gene, affecting its size, or Foxq1, which influences its sleekness, or Lypd1 or Atcay, which have effects respectively on its fearful nature and general skittishness. As one of the biggest suppliers of lab mice in the world, Jackson Lab, in Bar Harbor, Maine, has
a vast catalogue of such made-to- order mice.