Main Reaction: Sn + O-acetylserine >> cysteine

Reference: PubMed ID: 1102536
Authors: Paszewski A, Grabski J
Title: Enzymatic lesions in methionine mutants of Aspergillus nidulans: role and regulation of an alternative pathway for cysteine and methionine synthesis.
Published: 1975 Nov

Sn + O-acetylserine --> cysteine