sentence: Furthermore , the plasmids with 127 kb found in the four isolates ( T0124 , T0131 , T0137 , T0139 ) differed only by minor nucleotide changes ( 1 to 7 mutations ) from the pBtoxis plasmid ( NC_010076 ) , and none of the nucleotide changes was related to the δ - endotoxins ( Table 6 ) .