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Obama: Sudan one of "highest priorities"

N. Sudan officials say cannot hold Abyei vote on time

Tropical diseases plague poor but treatment cheap-WHO

South Sudan fears war as secession vote nears - US

Renegade commander starts talks with South Sudan

UN could police parts of north-south Sudan border

Sudan Abyei vote deadline "impossible": north

Tribes can solve Sudan's Abyei row alone: nomads

African scientists urged to develop their own medicines

Sudanese church leaders raise fears of war