Cancer cell division. Immunofluorescent light micrograph of cancer cells during the interphase stage of cell division (mitosis). Interphase is the resting stage of mitosis, when the cell's deoxyribonucleic acid (DNA, green) is replicated. Also seen is the actin cytoskeleton (red) and microtubules (red). Proteins are also synthesised and the cell increases in size. During mitosis a cell produces two genetically- identical daughter cells. Immunofluorescence uses antibodies to attach fluorescent dyes to specific cell tissues.