___________ is a sulphur containing amino acid.

Cysteine is one of the twenty amino acids commonly found in proteins. It contains a sulfur atom in its side chain, which is what makes it a sulfur-containing amino acid. This sulfur atom is important for forming disulfide bonds, which can help stabilize the structure of proteins by creating bridges between different parts of the protein molecule. Disulfide bonds are particularly important in maintaining the shape and stability of certain proteins, such as those found in hair, skin, and connective tissues. Additionally, cysteine plays a role in various biological processes, including the synthesis of glutathione, a powerful antioxidant.