Characterisation and expression analysis of a nitrate transporter and nitrite reductase genes,two members of a gene cluster for nitrate assimilation from the symbiotic basidiomycete<Emphasis Type="Italic"> Hebeloma cylindrosporum</Emphasis>
Laboratoire d'Ecologie Microbienne, UMR CNRS 5557, Université Claude Bernard Lyon 1, Bat. A. Lwoff, 43 Boulevard du 11 Novembre 1918, 69622 Villeurbanne, France.