<Tr> <Td> Lipoamide </Td> <Td> Electrons, acyl groups </Td> <Td> Bacteria, archaea and eukaryotes </Td> </Tr> <Tr> <Td> Methanofuran </Td> <Td> Formyl group </Td> <Td> Methanogens </Td> </Tr> <Tr> <Td> Molybdopterin </Td> <Td> Oxygen atoms </Td> <Td> Bacteria, archaea and eukaryotes </Td> </Tr> <Tr> <Td> Nucleotide sugars </Td> <Td> Monosaccharides </Td> <Td> Bacteria, archaea and eukaryotes </Td> </Tr>

Coenzymes are often amino acids that assist enzymes in metabolic reactions