passages.id: split_4_test_286_passage
passages.type: progene_text
passages.text: Our data demonstrate that the C - terminal p12 region of HIV-2 gag precursor protein , and zinc finger domains , are dispensable for gag VLP assembly , but the presence of at least one of the three prolines at amino acid positions 373 , 375 or 377 of HIV-2NIH-Z is required for VLP formation .