Lewis

Coat: Albino

Behavioral Disposition: Docile
Genetic Haplotype: RT1l
Inbreeding Purpose: Inbred recipient for several congenic strains
Physiological Characteristics: Exhibits increased levels of serum thyroxine, insulin, and growth hormone
Reproductive Performance: Average litter size of 7.5
Immune Susceptibility: Susceptible to the induction of autoimmune disease
Lineage and Origin: Descended from a nucleus colony acquired from the National Institutes of Health, Bethesda, Maryland.