The dense fibrillar component of this organelle is thought to be the location of synthesis of rDNA, which later expands to form this structure.  
The dense fibrillar component of this organelle is thought to be the location of synthesis of rDNA, which later expands to form this structure.  Transcriptional silencing of this rDNA leads to the production of pre-ribosomal RNAs, which are further modified by snRNAs to form mature ribosomal RNAs.  These ribosomal RNAs are exported by the Cajal bodies to the cytoplasm to form mature ribosomes.  FTP, name this site of synthesis for ribosomes, located inside the nucleus.
The dense fibrillar component of this organelle is thought to be the location of synthesis of rDNA, which later expands to form this structure.  
nucleolus