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Thank you for your call this week and for your patience while I have been in touch with the production lab about these proteins. I have confirmed with the lab that these proteins do not contain any tag. To detect them, you could use specific monoclonal antibody ab34756, which reacts with both proteins- https://www.abcam.com/Human-Polyoma-virus-JCV-capsid-protein-VP1-antibody-ab34756.html I hope this information will be useful, but please let me know if you have any further questions and I'll be happy to help.
Answered on Jan 12 2012