The Agilent 2100 bioanalyzer is the industry standard for RNA sample QC and has replaced labor-intensive gel electrophoresis for this application. It is also rapidly replacing gel electrophoresis for DNA fragment analysis and SDS-PAGE analysis of protein samples. A unique feature of the Agilent 2100 bioanalyzer is that it can be used for both electrophoretic separation and flow cytometric analysis of cell fluorescence parameters. This versatility makes the Agilent 2100 bioanalyzer an indispensable tool for the molecular biologist and biochemist.