An apparatus and method that prevents unauthorized extraction of content on a webpage is provided. The invention relates to isolation of CD8+ cell lines and cell clones that produce that antiviral activity and to the development of assay systems for detection of the antiviral activity. A fixer lamp applies ultraviolet rays of a predetermined range of wavelength to the recording sheet being conveyed, for optically fixing the recording sheet. These undesirable fringe fields pull toner away from image edges and cause other \u201cslow toner\u201d effects, particularly in high speed systems. The formulation of the ink includes an adhesion promoter and is adaptable to adhere to the surface of the protective coating with the adhesion promoter. A filter is disposed within each of the filter housings.