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Protocols for the proteome analysis of
Arabidopsis
tissues based on 2 D gel electrophoresis are given for leaves and roots as well as for seeds. The protocols contain a detailed description of the sample preparation step and of the solubilization of proteins. We then describe our protocols for the isoelectric focusing, the transfer of the strips from the first to the second dimension,
SDS
-PAGE as the second dimension of electrophoretic separation, staining of the gels using colloidal Coomassie blue, and finally drying of the gels between cellophane sheets. Notes contain additional background information on critical steps. Our protocols allow the analysis of leaves, roots, or seeds from different
Arabidopsis
ecotypes, from mutants or from plants subjected to various environmental conditions.