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[biznatch]

I want to do ChIP for Polymerase II phosphoserine 2 and phosphoserine 5 in mouse tissue.  I can use these antibodies, which are mouse IgM antibodies.  Should I use protein L magnetic beads or anti-mouse IgM magnetic beads to bind the antibodies after IP?  I found this document which says that protein L should be used for mouse IgM antibodies as long as "the immunoglobulin has the appropriate kappa light chains".  How do I know if the PolII antibodies have the appropriate kappa light chains?  I found one paper that used these specific PolII antibodies with these specific protein L magnetics beads, but other papers use anti-mouse IgM beads (not necessarily the ones I've listed, I would like magnetic beads though).