- Ovochymase 1 (OVCH1)
- Branched Chain Keto Acid Dehydrogenase E1 Beta (BCKDHb)
- Branched Chain Keto Acid Dehydrogenase E1 Alpha (BCKDHa)
- O-Sialoglycoprotein Endopeptidase (OSGEP)
- O-Linked-N-Acetylglucosamine Transferase (OGT)
- Nuclear Casein Kinase And Cyclin Dependent Kinase Substrate 1 (NUCKS1)
- Neuropathy Target Esterase (NTE)
- N-Terminal Asparagine Amidase (NTAN1)
- N-Acetylneuraminate Pyruvate Lyase (NPL)
- Nicotinamide-N-Methyltransferase (NNMT)
- Nicotinamide Nucleotide Transhydrogenase (NNT)
- Nicotinamide Nucleotide Adenylyltransferase 2 (NMNAT2)
- Nicotinamide Nucleotide Adenylyltransferase 3 (NMNAT3)
- Nicotinamide Nucleotide Adenylyltransferase 1 (NMNAT1)
- Nemo Like Kinase (NLK)
