TRANSFORMATION OF A NITRATE REDUCTASE DEFICIENT MUTANT OF PENICILLIUM-CHRYSOGENUM WITH THE CORRESPONDING ASPERGILLUS-NIGER AND ASPERGILLUS-NIDULANS NIAD GENES ‌ Whitehead, M, Unkles, S, Ramsden, M, Campbell, E, Gurr, S, Spence, D, Vandenhondel, C, Contreras, R, Kinghorn, J