Help! Immunoprecipitation beads that mouse IgM can bind

[Naohiro Kohmura]

  Hi!
 I want to try immunoprecipitation by a mouse monoclonal antibody. 
But it is IgM, not IgG. Does anybody know anti-mouse IgM-binding beads,
 or beads that mouse IgM can bind? From where can I get? Protein A beads
can
 bind to human IgM, but can't to mouse IgM. Any comment?

Thanks in advance.

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Naihiro Kohmura
kohmura at nips.ac.jp