passages.id: split_6_test_3104_passage
passages.type: progene_text
passages.text: Block IV in the L1 repressor is part of the most charged region encompassing amino acid residues 72 - 92 , which flanks the putative N - terminal basic ( residues 1 - 71 ) and C - terminal acidic ( residues 93 - 183 ) domains of L1 repressor .