Fidelity Advisor Mortgage Securities I (FMSCX)

The fund normally invests at least 80% of assets in investment-grade mortgage-related securities (those of medium and high quality) and repurchase agreements for those securities. It invests in U.S. government securities and instruments related to U.S. government securities. The fund invests in U.S. government securities issued by entities that are chartered or sponsored by Congress but whose securities are neither issued nor guaranteed by the U.S. Treasury.