While many people are more familiar with U.S. savings bonds and Treasuries, U.S. government agency bonds can also contribute to your investment portfolio. As a savvy investor, you should be familiar with three key members of the government agency bond family--Ginnie Mae, issued by the Government National Mortgage Association (GNMA); Fannie Mae, issued by the Federal National Mortgage Association (FNMA); and Freddie Mac, issued by the Federal Home Loan Mortgage Corporation (FHLMC).

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