Cervical cancer metastasis research. Fluorescence light micrograph of HeLa cervical cancer cells being studied for key molecular events that turn healthy cells into cancerous ones. The highlighting shows the interactions of a kinase called LKB1 (in green), a cytoskeletal signalling protein called pFAK (red), and the cell nucleus (blue). These images are examining the influence of LKB1 in regulating FAK activity, which is frequently disrupted during cancer cell motility (movement) and the spread of cancer. HeLa cells are a continuously cultured cell line of human cancer cells. They are immortal and so thrive in the laboratory. HeLa cells are widely used in biological and medical research.