Table 1.

.  Nucleolar proteins involved in the regulation of mRNA metabolism

The main steps of mRNA metabolism are indcated and underlined. The 25 proteins belonging to classes C4 and C5 (see Figure 5A) are classified according to their demonstrated implication in mRNA metabolism. Proteins in bold are involved in several steps. Proteins in italics and regrouped at the end of each section are proteins with hypothetical functions. Each protein is followed by one or several numbers that refer to articles listed at the bottom of the table. This functional classification is based on these articles.