To achieve its investment objective by investing, under normal circumstances, at least 80 percent of its net assets (plus any borrowings for investment purposes) in agency mortgage-backed securities (MBS) of any maturity or type. For purposes of this policy, agency MBS are deemed to be MBS issued or guaranteed by, or secured by collateral that is guaranteed by, the U.S. government, its agencies, instrumentalities or sponsored corporations such as the Government National Mortgage Association (GNMA or Ginnie Mae), the Federal National Mortgage Association (FNMA or Fannie Mae) or the Federal Home Loan Mortgage Corporation (FHLMC or Freddie Mac) (generally, an Agency or Agencies), including residential mortgage-backed securities (RMBS), commercial mortgage-backed securities (CMBS), collateralized mortgage obligations (CMOs), mortgage pass-through securities, and stripped mortgage-backed securities.