Task: Text Categorization
Input (English): The RAN protein is used for the transport of materials in and out of the pores of this organelle. Observed with Hoechst and DAPI staining, this organelle, when found in tumors, contains Cajal bodies. Continuous with the rough endoplasmic reticulum, this organelle is the site of histone proteins, as well as the production of ribosomes and transcription of DNA. Not found in prokaryotes, for 10 points, name this "control center" of the cell.
Output (English): Science