Main Reaction: L-Homocysteine + L-Serine >> L-Cystathionine

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

L-Homocysteine + L-Serine --> L-Cystathionine