Figure 4
Comparison of the nitrate assimilation gene cluster in A. nidulans and P. angusta . White, nitrate transporter, yellow nitrate reductase, blue nitrite reductase, green transcription factors. In A. nidulans a second transporter gene (ntrB) and the nirA transcription factor gene are in the same chromosome (VIII) as the gene cluster but not genetically linked to it or to each other.