passages.id: split_1_test_755_passage
passages.type: progene_text
passages.text: Nature 380 , 85 - 88 ; Roth , D.B. , Menetski , J.P. , Nakajima , P.B. , Bosma , M.J. , Gellert , M. , 1992. V(D)J recombination : broken DNA molecules with covalently sealed ( hairpin ) coding ends in scid mouse thymocytes .