Dear Histonet,

I am trying to find out the epitope sequence of the primary antibody targeting kappa opioid receptors, marketed by Sigma (Cat. O1757).   Their website and data sheets only describe the epitope as 'internal 
region'.   The literature articles referenced in the data sheet do not comment on this specific antibody.   When I e-mailed the company they wouldn't tell me what the epitope sequence was (it probably required more effort than checking the website), and they also refused to identify the manufacturer.   Information about any prior testing would also be appreciated.

I have been using this antibody and I feel that this lack of information might reduce the publishability of my work.

Link:  
http://www.sigmaaldrich.com/cgi-bin/hsrun/Suite7/Suite/Suite.hjx;start=Suite.HsViewHierarchy.run?Detail=Product&ProductNumber=SIGMA-O1757&VersionSequence=1

Thank you,

Andrew Gray
PhD student

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