Abstract
Three monoclonal antibody subclasses (IgG1, IgG2a, and IgM) were raised to the phosphoprotein B2 (Mr 68000, pI6.5-8.2) which has been shown previously to be associated with the nucleosomes of rat liver nuclei. These antibodies do not show any significant cross reactivity with CM-cellulose 'unbound' non-histone chromosomal proteins, bovine serum albumin or histones. Further verification of the specificity of these antibodies to this phosphoprotein was carried out using both 'dot' blot and immunological transfer analysis ('Western blot'). The monoclonal antibodies (IgG1 and IgG2a) could also be used to semi-quantify the phosphoprotein B2 in rat liver nuclei. The high specificity and unlimited availability of this type of probe provides a means to study the role(s) of this phosphoprotein in the overall scheme of actively transcribed chromatin.
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