1. A polynucleotide comprising a sequence encoding a non-naturally occurring fusion protein comprising a zinc finger DNA-binding protein that binds to an endogenous albumin gene and a cleavage domain, wherein the non-naturally occurring fusion protein cleaves the endogenous albumin gene and further wherein the zinc finger DNA-binding protein comprises 4, 5 or 6 zinc finger domains, each zinc finger domain comprising a recognition helix region, wherein the zinc finger domains comprise the recognition helix regions in the order shown in a single row of the following Table: