Non‐isotopic in situ hybridization at the ultrastructural level

Non‐isotopic in situ hybridization techniques are becoming increasingly widely used at the ultrastructural level, permitting rapid localization of nucleic acid targets with a high degree of resolution. Technical considerations dictate that the great specificity of the method cannot be matched by a similar degree of sensitivity; the value of non‐isotopic ultrastructural in situ hybridization lies in its unique ability to localize nucleic acid targets in relation to submicroscopic cellular structures. This article presents an overview of non‐isotopic ultrastructural hybridization methods and applications.