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Hydrogen sulfide (H2S) is a well-known toxic gas that has the smell of rotten eggs.This pungent gas is synthesized from the amino acids:cysteine and homocysteine by four enzymes:cystathionine-β-synthase (CBS),cystathionine-γ-lyase (CSE) and mercaptopuryvate sulphurtransferase (3-MST) along with cysteine aminotransferase (CAT).