Prepayment And Extension Risk Member Prepayment And Extension Risk Member Mortgage Dollar Rolls Risk Member Mortgage Dollar Rolls Risk Member GOVERNMENT BOND FUND GOVERNMENT BOND FUND, S000005968 Market Risk Member Market Risk Member INFLATION-ADJUSTED BOND FUND R6 CLASS INFLATION-ADJUSTED BOND FUND R6 CLASS, C000191079 GINNIE MAE FUND C CLASS GINNIE MAE FUND C CLASS, C000088034 Bloomberg U.S. Government/MBS Index Bloomberg U.S. Government/MBS Index CAPITAL PRESERVATION FUND INVESTOR CLASS CAPITAL PRESERVATION FUND INVESTOR CLASS, C000016429 INFLATION-ADJUSTED BOND FUND R5 CLASS INFLATION-ADJUSTED BOND FUND R5 CLASS, C000016439 Collateralized Obligations Risk Member Collateralized Obligations Risk Member INFLATION-ADJUSTED BOND FUND Y CLASS INFLATION-ADJUSTED BOND FUND Y CLASS, C000181797 GOVERNMENT BOND FUND I CLASS GOVERNMENT BOND FUND I CLASS, C000189732 GOVERNMENT BOND FUND A CLASS GOVERNMENT BOND FUND A CLASS SHORT-TERM GOVERNMENT FUND C CLASS SHORT-TERM GOVERNMENT FUND C CLASS, C000088041 GINNIE MAE FUND I CLASS GINNIE MAE FUND I CLASS, C000189731 Liquidity Risk Member Liquidity Risk Member GOVERNMENT BOND FUND INVESTOR CLASS GOVERNMENT BOND FUND INVESTOR CLASS, C000016435 CAPITAL PRESERVATION FUND CAPITAL PRESERVATION FUND, S000005965 SHORT-TERM GOVERNMENT FUND INVESTOR CLASS SHORT-TERM GOVERNMENT FUND INVESTOR CLASS, C000016440 SHORT-TERM GOVERNMENT FUND SHORT-TERM GOVERNMENT FUND, S000005970 Bloomberg U.S. 1-3 Year Government Bond Index Bloomberg U.S. 1-3 Year Government Bond Index Interest Rate Risks Member Interest Rate Risks Member High-Yield Risk Member High-Yield Risk Member SHORT-TERM GOVERNMENT FUND R CLASS SHORT-TERM GOVERNMENT FUND R CLASS, C000088042 GOVERNMENT BOND FUND R CLASS GOVERNMENT BOND FUND R CLASS INFLATION-ADJUSTED BOND FUND I CLASS INFLATION-ADJUSTED BOND FUND I CLASS, C000181796 Derivatives Risk Member Derivatives Risk Member INFLATION-ADJUSTED BOND FUND G CLASS INFLATION-ADJUSTED BOND FUND G CLASS, C000191080 GINNIE MAE FUND GINNIE MAE FUND, S000005966 Bloomberg U.S. Treasury Inflation Protected Securities (TIPS) Index Bloomberg U.S. Treasury Inflation Protected Securities (TIPS) Index American Century Government Income Trust American Century Government Income Trust INFLATION-ADJUSTED BOND FUND A CLASS INFLATION-ADJUSTED BOND FUND A CLASS, C000016438 SHORT-TERM GOVERNMENT FUND A CLASS SHORT-TERM GOVERNMENT FUND A CLASS, C000016441 Bloomberg U.S. GNMA Index Bloomberg U.S. GNMA Index INFLATION-ADJUSTED BOND FUND R CLASS INFLATION-ADJUSTED BOND FUND R CLASS, C000088039 GINNIE MAE FUND A CLASS GINNIE MAE FUND A CLASS, C000016431 GOVERNMENT BOND FUND C CLASS GOVERNMENT BOND FUND C CLASS Credit Risks Member Credit Risks Member GINNIE MAE FUND R CLASS GINNIE MAE FUND R CLASS, C000051003 GOVERNMENT BOND FUND R5 CLASS GOVERNMENT BOND FUND R5 CLASS Bank Loan Risk Member Bank Loan Risk Member SHORT-TERM GOVERNMENT FUND R5 CLASS SHORT-TERM GOVERNMENT FUND R5 CLASS, C000088040 When-Issued And Forward Commitment Risk Member When-Issued And Forward Commitment Risk Member SHORT-TERM GOVERNMENT FUND I CLASS SHORT-TERM GOVERNMENT FUND I CLASS, C000189733 GINNIE MAE FUND INVESTOR CLASS GINNIE MAE FUND INVESTOR CLASS, C000016430 INFLATION-ADJUSTED BOND FUND INFLATION-ADJUSTED BOND FUND, S000005969 INFLATION-ADJUSTED BOND FUND C CLASS INFLATION-ADJUSTED BOND FUND C CLASS, C000088038 Mortgage- And Asset-Backed Securities Risk Member Mortgage- And Asset-Backed Securities Risk Member Redemption Risk Member Redemption Risk Member GINNIE MAE FUND R5 CLASS GINNIE MAE FUND R5 CLASS, C000051002 INFLATION-ADJUSTED BOND FUND INVESTOR CLASS INFLATION-ADJUSTED BOND FUND INVESTOR CLASS, C000016437 Inflation-Indexed Bonds Risk Member Inflation-Indexed Bonds Risk Member Foreign Securities Risk Member Foreign Securities Risk Member Bloomberg U.S. Aggregate Bond Index Bloomberg U.S. Aggregate Bond Index