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Improved sensitivity for high resolution in situ hybridization using resin extraction of methyl methacrylate embedded
1Department of Biological Sciences, School of Science, University of Tokyo, Hongo, Japan.
Abstract:
An in situ hybridization procedure resulting in both high resolution and sensitivity was established by using the removable methyl methacrylate resin, Technovit 9100. Young bicellular pollen of tobacco (Nicotiana tabacum L. SR-1) was embedded in Technovit 9100 resin and sectioned. The resin was extracted with (2-methoxyethyl)-acetate followed by in situ hybridization with cRNA probes to detect cytoplasmic 18S/25S rRNA. Signal intensity obtained by this procedure was approximately twice as great as that obtained by an earlier procedure using Technovit 7100, a glycol methacrylate resin that cannot be removed from sections. This improvement in sensitivity made it possible to observe subcellular localization of small amounts of RNA as revealed by visualization of plastid 23S rRNA in a generative cell of Plumbago auriculata pollen.
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