miRNA Northern blot kits are non-radioactive with all reagents included, and the probes are biotin pre-labeled. Signosis also provides the Highly Sensitive Northern Blot Assay kits, which are 100 times more sensitive than conventional chemiluminescent detection.
Carl Novina with a sequencing gel. A sequencing gel is used to separate small RNA species. After high voltage separation in the sequencing gel, the small RNAs are transferred to a cellulose membrane and detected with radioisotopes - labeled RNAs. This procedure is a specialized adaptation of traditional Northern blotting caled modified Northern blotting.