passages.id: split_1_test_1450_passage
passages.type: progene_text
passages.text: Our mutants included sequential 2-amino acid ( Delta2 - Delta14 ) and an 11 - amino acid deletion from the COOH - terminal end , deletions of 6 or 8 amino acids from the NH ( 2 ) - terminal and middle regions , and a deletion of 12 amino acids from the NH ( 2 ) - terminal end of the TM domain .