Spontaneous mutation congenic on C57BL6/J. The obese mutation is a point mutation in the gene encoding leptin. Leptin, expressed predominantly in adipose tissue of normal mice, is not expressed in mice homozygous for the mutation ob. To Charles River Laboratories France from The Jackson Laboratory in May 2002.

JAX™ Mice Stock Number


Bred In



Heterozygote from the colony or C57BL/6J


5K20 or equivalent

Coat Color


Ideal For:

Obesity research, wound healing

Strain Code:



Partnership Information

Note: Charles River is the exclusive distributor of JAX™ Mice in 29 European countries. Only The Jackson Laboratory and Charles River in Europe and Japan maintain colonies of JAX™ Mice strains which are derived from pedigreed mice from The Jackson Laboratory and are re-infused routinely with pedigreed mice to stabilise the genetic integrity and phenotype of these strains.

JAX™ is a trademark of The Jackson Laboratory registered in the United States. All rights reserved.

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