The maturation process of the rRNAs and the process of recruiting the r-proteins happen in precursor ribosomal particles, sometimes called pre-ribosomes, and takes place in the nucleolus, nucleoplasm, and cytoplasm.
The maturation of rRNAs and the recruitment of r-proteins occur in precursor ribosomal particles, often referred to as pre-ribosomes, within the nucleolus, nucleoplasm, and cytoplasm.