From the given sentence, extract the phrase (often noun or verb) that carries the given relationship. The generated phrase should be present in the sentence.

Given Relationship: 'be region in', Sentence: 'The government of Chad has withdrawn from the African Union-brokered peace talks on Sudan 's troubled Darfur region .'
region

Given Relationship: 'believe in', Sentence: 'The Roman Catholic Church , that is , the Latin Rite Catholic Church , and other Catholic Churches in communion with Rome believe that the Eucharist is the Real Presence of Jesus Christ , body , blood , soul and divinity .'
believe

Given Relationship: 'be cause by', Sentence: 'Human monocytes express the cell surface glycoprotein CD4 and the co-receptor CCR5 and can be infected by the HIV virus which causes AIDS .'

causes