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Imagine having tube after tube of competent cells for your transformations, all (virtually) free of charge. The way to reach this nirvana is to make your own competent cells. Traditionally this can be a tricky feat, but the procedure laid out in this guide makes it simple and routine.

Save time and hassle when making up your solutions or calculating your DNA concentration, thanks this lab math calculator spreadsheet. Preloaded with common calculations for molecular biologists, the spreadsheet allows you to easily and quickly get the answers you need.