71.   Mortgage securities, meanwhile, lagged Treasuries as lower rates boosted concern that refinancings are set to accelerate.

72.   Mortgage bonds also outperformed Treasuries as steadier interest rates eased concern homeowners will prepay the loans that back mortgage securities.

73.   Mortgage bonds outperformed Treasuries as interest rates rose, easing concern homeowners will prepay the loans that back mortgage securities.

74.   Mortgage securities gained less than Treasuries amid concern that prepayments will rise, analysts and traders said.

75.   Mortgage securities gained less than U.S. Treasuries amid concern that more consumers will refinance the underlying loans, redeeming the bonds early.

76.   Mortgage securities gained on Treasuries for the first time in six days.

77.   Mortgage securities lagged Treasuries amid concern lower rates could entice homeowners to refinance and return principal to bondholders early.

78.   Mortgage securities lost as much as Treasuries amid concern the bonds will be redeemed early by a wave of refinancings.

79.   Mortgage securities lost as much as Treasuries as a one-month increase in rates calmed concern the bonds will be redeemed early.

80.   Mortgage securities outpaced Treasuries for a second day as higher rates calmed concern about refinancings.