Figure 1

Electrophoretic profile of the DNA fragment corresponding to the S100A7 gene after PCR amplification on 1.5% agarose gel (w/v). a, θX174 DNA ladder in kbp; b, amplification of cDNA of tracheal head and neck squamous cell carcinoma (HNSCC) tissue; c, nested PCR of amplification of the DNA fragment, with the presence of the fragment of approximately 306 bp in both lanes; d, control (PCR without template).