Synthetic Securities Risk. Fluctuations in the values of synthetic securities may not correlate perfectly with the instruments they are designed to replicate. Synthetic securities may be subject to interest rate changes, market price fluctuations, counterparty risk and liquidity risk.

Active Trading Risk. The Fund engages in frequent trading of portfolio securities. Active trading results in added expenses and may result in a lower return and increased tax liability.

Market Risk. Market risk is the possibility that the market values of securities owned by the Fund will decline. The prices of debt securities tend to fall as interest rates rise, and such declines tend to be greater among debt securities with longer maturities or longer durations. The yields and market prices of U.S. government securities may move differently and adversely compared to the yields and market prices of the overall debt securities markets. U.S. government securities, while backed by the U.S. government, are not guaranteed against declines in their market prices.

Mortgage- and Asset-Backed Securities Risk. The Fund may invest in mortgage- and asset-backed securities that are subject to prepayment or call risk, which is the risk that the borrower's payments may be received earlier or later than expected due to changes in prepayment rates on underlying loans. Faster prepayments often happen when interest rates are falling. As a result, the Fund may reinvest these early payments at lower interest rates, thereby reducing the Fund's income. Conversely, when interest rates rise, prepayments may happen more slowly, causing the security to lengthen in duration. Longer duration securities tend to be more volatile. Securities may be prepaid at a price less than the original purchase value. An unexpectedly high rate of defaults on the mortgages held by a mortgage pool may adversely affect the value of mortgage-backed securities and could result in losses to the Fund. The risk of such defaults is generally higher in the case of mortgage pools that include subprime mortgages. Subprime mortgages refer to loans made to borrowers with weakened credit histories or with lower capacity to make timely payments on their mortgages.

Credit Risk. Credit risk refers to an issuer's ability to make timely payments of interest and principal. Credit risk should be low for the Fund because it invests primarily in obligations issued or guaranteed by the U.S. government, its agencies or instrumentalities.

Income Risk. The income you receive from the Fund is based primarily on interest rates, which can vary widely over the short-and long-term. If interest rates drop, your income from the Fund may drop as well. The more the Fund invests in adjustable, variable or floating rate securities or in securities susceptible to prepayment risk, the greater the Fund's income risk.

Prepayment Risk. If interest rates fall, the principal on debt securities held by the Fund may be paid earlier than expected. If this happens, the proceeds from a prepaid security would likely be reinvested by the Fund in securities bearing the new, lower interest rates, resulting in a possible decline in the Fund's income and distributions to shareholders.

Extension Risk. The prices of debt securities tend to fall as interest rates rise. For mortgage-backed securities, if interest rates rise, borrowers may prepay mortgages more slowly than originally expected. This may further reduce the market value of the securities and lengthen their durations.

Derivative Instruments. The performance of derivative instruments is tied to the performance of an underlying currency, security, index or other instrument. In addition to risks relating to their underlying instruments, the use of derivatives may include other, possibly greater, risks. Derivatives involve costs, may be volatile, and may involve a small initial investment relative to the risk assumed. Risks associated with the use of derivatives include counterparty, leverage, correlation, liquidity, tax, market, interest rate and management risks. Derivatives may also be more difficult to purchase, sell or value than other investments. The Fund may lose more than the cash amount invested on investments in derivatives. Investors should bear in mind that, while the Fund intends to use derivative strategies, it is not obligated to actively engage in these transactions, generally or in any particular kind of derivative, if the investment manager elects not to do so due to availability, cost, market conditions or other factors.

Borrowing Risks. The Fund may borrow money for investment purposes, which is known as leverage. The Fund may use leverage to seek to enhance income to shareholders, but the use of leverage creates the likelihood of greater volatility in the net asset value of the Fund's shares. To the extent that income from investments made with such borrowed money exceeds the interest payable and other expenses of the leverage, the Fund's net income will be less than if the Fund did not use. The Fund's use of leverage also may impair the ability of the Fund to maintain its qualification for federal income tax purposes as a regulated investment company.

U.S. Government Obligations Risk. The Fund may invest in obligations issued by U.S. Government agencies and instrumentalities that may receive varying levels of support from the government, which could affect the Fund's ability to recover should they default.