Plasmid miniprep kits contain reagent sets and protocols for extracting plasmid DNA from bacterial cells and purifying them for downstream molecular biology applications. Purified plasmid DNA is often used in DNA cloning, DNA libraries, gene expression studies, and DNA sequencing. As the components within the kit are ready to use, miniprep kits are useful for rapidly obtaining DNA starting material in small-scale molecular workflows. Many kits utilize spin columns when separating cellular components; however, vacuum and magnetic-based methods are also available. A variety of kit suppliers are shown below. Visit the supplier pages for more information, such as methodology or appropriate plasmid sizes.