Cervical cancer cells, coloured scanning electron micrograph (SEM). The cervix is the lower part of the womb, also called the neck of the womb and comprises part of the woman?™s reproductive system. Cervical cancer is more common in younger women and one of the main causes is a persistent infection of certain types of the human papilloma virus (HPV). The central cell in this image has long extending filopodia-like structures. Filopodia contain actin filaments and can have roles in numerous processes including cell-cell interactions, cell migration or as a sensory guide towards a chemoattractant, which is a chemical agent that induces a cell to migrate towards it. This may promote tumour growth and the development of metastasis. Magnification: x1600 when printed at 10cm wide.