Figure 3.

Plant specific nucleolar proteins. (A) Shown is the distribution of proteins without orthologues in yeast and human in total numbers. (B-D) Classification of proteins found exclusively in the nucleolar fraction (B; Table S9), in nucleolar and nuclear fraction (C; Table S10) and in the 3 fractions analyzed (D; Table S11). Total number is given in gray, protein function confirmed by publication is shown in white (UN, unknown; M&E, metabolism and enzymatic function; TF, transcription factor and regulation activity; C&H, chromatin remodeling, histone and histone modification; D&R, DNA/RNA binding or processing; S&D, signal transduction and protein degradation; C&C, definition of intracellular structures and proteins of the cytoskeleton; M&V, membrane proteins and proteins involved in vesicular transport; OO, proteins of other organelles).