Immunofluorescent Light Micrograph of melanoma cancer cells invading the skin epithelium seen in a culture preparation At centre is a tumour of cancer orange derived from melaninforming cells of the skin Normal epithelial skin cells are green Each cell nucleus stains blue Melanoma is a highly malignant cancer consisting of large undifferentiated cells with a capacity to divide rapidly and invade surrounding healthy tissue Immunofluorescence is a staining technique which uses antibodies to attach fluorescent dyes to specific tissues and to molecules within the cell Magnification x at mm size x at xcm