On the basis of the chemical structure of different side chains, GSLs are classified into aliphatic, indolic, and aromatic GSLs, with methionine (or alanine, valine, leucine, Horticulturae 2021, 7, 173. https://doi.org/10.3390/horticulturae7070173 https://www.mdpi.com/journal/horticulturae ...