PTK2 and melanoma: In this line, the centipede glycosphingolipid peptide-7 from the millipede - Parafontaria laminata armigera exerts an antiproliferative effect on neoplastic cells and inhibits the focal adhesion kinase (FAK) pathway in addition to the signal-regulated kinase (Erk) 1 and 2, both involved in the proliferation of melanoma cells.