Hello Jan!
IBA GmbH has engineered the Strep tag. To my knowledge, they also
provide the best antibody against it: StrepMAB-Classic. Additionally to
the specifications in their data sheet, it can also be used for western
blots; we can hardly see any background. Have a look here:
http://www.iba-go.de/prottools/index.php?prot_p_poly.html .
Niko
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