antibody against Ig light chain

[didier]

hi, I was wondering if anybody has ever heard (article, technical note
from company?) about the description of an antibody able to recognize
only the light chain (rabbit) of antibody. this reagent would be useful
when one want to probe IP material to reveal coimmunoprecipitating
protein .usually , we get only a dark autoradiographie up to 45 kd due
to the antibody heavy chain! to avoid this people usually biotynilate
their antibody.

any information wellcome!

didier