We also performed immunofluorescent staining of tumour and normal cell cultures (L2T, L2N, L6T, L6N, L7T, L7T, L15T, E1N, E1T, P1P, P3T, P4T) with antibodies to the nuclear proliferation antigen Ki67 (Supplementary Figure 1b). This evidence concerns the gene MKI67 and neoplasm.