passages.id: split_1_test_1984_passage
passages.type: progene_text
passages.text: Asymmetrically cleaving diadenosine 5',5"'-P(1),P(4)-tetraphosphate ( Ap4A ) hydrolase activity has been detected in extracts of adult Caenorhabditis elegans and the corresponding cDNA amplified and expressed in Escherichia coli .