Looking for primary antibody to BiP (grp78) for flow cytometry - (Nov/01/2007 )

Hi,

I am trying to look at BiP expression in a human myeloma cell line and would like to know if anyone has had experience with antibodies to this protein. Specifically, any great antibodies or ones from companies I should avoid?

I have been using Anti-GRP78/Bip (GL-19) from SIGMA.
I used for western blotting and IP it works well.
Hope this helps.

Thanks :