realizes has_specified_input has_specified_output inheres in ribonucleic acid measurement datum analyte role analyte assay northern blot assay An assay that determines the presence of gene transcripts by hybridizing labeled RNA or DNA probes against messenger RNAs isolated from tissue or cell cultures, resolved on denaturing gel, transfered by a blotting procedure to a solid support. Detection of hybridization signals is carried out by immunofluorescence or radioactivity measurements using photographic films or digital imaging devices such as Phosphor Imager. Philippe Rocca-Serra Richard Scheuermann The level of actin mRNA levels in normal and diseased tiisue was measured using a northern blot assay. northern blot northern blot assay metadata incomplete