Swartz:Protocols/Purification of His-tagged proteins
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See Purification_of_His-tagged_proteins and https://docs.google.com/document/d/1OqY94AYARJD84spfuFVZ_YX1Ypa-i717sxUUJU2GJ9Y/edit
For purification of Cell-free proteins see https://docs.google.com/document/d/1bSKL1hx6VjR3rMI4UtpCcMEDm7OYm8pnpkQHids4v5g/edit