sentences:  Among the most abundant ergot alkaloids in epichloë-symbiotic grasses is ergovaline, comprising an ergoline moiety attached to a bicyclic tripeptide containing the amino acids L-proline, L-alanine, and L-valine.Key genes and enzymes for ergot alkaloid biosynthesis have been identified in epichloae and include "dmaW", encoding dimethylallyl-tryptophan synthase and "lpsA", a non-ribosomal peptide synthetase.Another group of epichloë alkaloids are the indole-diterpenoids, such as lolitrem B, which are produced from the activity of several enzymes, including prenyltransferases and various monooxygenases.