GENE KNOCKOUTS SHOWING VARIOUS EFFECTS OF THE GENE ON PHENOTYPE c-Fos CREB CSF-1 Fmr1 Inducible nitric oxide synthase (iNOS) Insulin-like growth factor I receptor (IGF-IR) Insulin receptor substrate-1 (IRS-1) Mannose 6-phosphate receptor mdrla P-glycoprotein Metallothionein I and II (MT I and II) Perforin and Fas PrP Stat 1 Transthyretin