A 5-methyltryptophan resistant Nicotiana anthranilate synthase genes are disclosed, in particular the ASA2 gene of Nicotiana tabacum. Constructs containing the genes are also disclosed. This genes are useful for transforming plant cells and producing transformed plants and progenies which, compared to...http://www.google.fr/patents/US6563025?utm_source=gb-gplus-shareBrevet US6563025 - Nucleotide sequences encoding anthranilate synthase