Molecular analyses of the transformed plant show that the event TC1507 contains one site of integration of the introduced DNA which includes a full-length of the DNA fragment used for transformation (i.e. the ~6235 bp of DNA cassette containing the cry1F and pat genes) and an additional copy of the cry1F gene lacking the majority of the associated ubiquitin regulatory sequences.

Southern analysis using a cry1F probe carried out by the European Food Safety Authority (EFSA; see document below) revealed the presence of two cry1F inserts. The first represented the intact gene from the expression cassette. The second insert was a truncated cry1F  fragment of 335bp, which is located at the 5’ end of the insertion locus. In addition, analysis of the sequences adjacent to the insert of fragment PHI8999A revealed DNA fragments that correspond to small segments from PHI8999A, including incomplete sequences from the pat gene, the maize ubiquitin promoter and the terminator from Agrobacterium. Furthermore, different fragments of chloroplast DNA and a number of sequences with similarity to retrotransposons are also present in the border region of the insert.