Main Reaction: hydrogen sulfide + O-Acetyl-L-Serine >> L-Cysteine

Reference: PubMed ID: 3120640
Authors: Nüesch J, Heim J, Treichler HJ
Title: The biosynthesis of sulfur-containing beta-lactam antibiotics.
Published: 1987

hydrogen sulfide + O-Acetyl-L-Serine --> L-Cysteine