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ND5

provides instructions for making a protein called NADH dehydrogenase 5. This protein is part of a large enzyme complex known as complex I, which is active in mitochondria

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Amino Acid Codes:

Leucine 

Leucine is one of the three branched-chain amino acids an amino acid having an aliphatic side-chain with a branch used as a source of energy. 

The side chain is the non-polar, hydrophobic "R group" the side chain attached to the central alpha carbon

The alpha carbon is the core of each amino acid, linking all the essential functional groups all connected to this central alpha carbon

Serine

It's classified as a polar amino acid

Polar amino acids are a group of amino acids with hydrophilic side chains

those that are attracted to water and have a strong affinity for aqueous environments

that can form hydrogen bonds with water

due to its hydroxyl group side chain. Serine is also a precursor for other amino acids like glycine

Three amino acids (serine, threonine, and tyrosine) have a hydroxyl group in their side chain. 

Serine and threonine have aliphatic hydroxyl groups, while tyrosine has a hydroxyl group on an aromatic ring, making it a phenol

Histidine

A precursor for histamine, a neurotransmitter involved in various bodily functions. 

Histidine also has unique acid/base properties due to its imidazole side chain

The only standard proteinaceous amino acid containing an imidazole functional group is histidine

its imidazole ring plays a crucial role in the process of maintaining a stable pH by neutralizing excess acids or bases