On the other hand, it is also possible that infection and lysis of the vegetative cells would reduce or even prevent the supply of glutamate produced by GOGAT (glutamine oxoglutarate aminotransferase) in vegetative cells, which is used as a substrate by the glutamine synthetase (GS) in the heterocytes to produce Gln, a process during which fixed nitrogen is incorporated into amino acids. This evidence concerns the gene GLUL and infection.