A Membrane Bounded Organelle of Eukaryotic Cells in Which Chromosomes Are Housed and Replicated. in Most Cells the Nucleus Contains All of the Cell's Chromosomes Except the Organellar Chromosomes and Is the Site of RNA Synthesis and Processing. in Some Species or in Specialized Cell Types RNA Metabolism or DNA Replication May Be Absent.
Interacting Selectively and Non Covalently with a Nucleotide Any Compound Consisting of a Nucleoside That Is Esterified with (ortho)phosphate or an Oligophosphate At Any Hydroxyl Group On the Ribose or Deoxyribose.
Stops Prevents or Reduces the Activity of Serine Type Endopeptidases Enzymes That Catalyze the Hydrolysis of Nonterminal Peptide Bonds in a Polypeptide Chain; a Serine Residue (and a Histidine Residue) Are At the Active Center of the Enzyme.