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Feeling victimized by your latest Western blot? Whether you're dealing with no bands, faint bands, multiple bands, high background signal, uneven transfer, or *shudders* smearing, this handy troubleshooting card can help you gain clarity.

There are some lab math calculations that almost all molecular biologists need to perform, and often on a regular basis. Make sure you never mess up a solution or miscalculate your DNA concentration again, with our handy lab math cheat sheet. Print it out and stick it on your bench.