Abstract
Ribosomal RNA, labelled with uridine and methionine, from dividing and post-mitotic mouse prenatal muscle cell cultures, has been characterised on polyacrylamide gels. Progress of differentiation in cultures was monitored by recording changing proportions of nuclei in myotubes, and increases in creatine kinase activity. Ribosomal RNA synthesis in myotubes is reduced relative to that in dividing cell cultures and considerable wastage of processed ribosomal RNA occurs. This changed pattern of ribosomal RNA production appears to be established in the post-mitotic myoblasts prior to fusion.
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