Bikaverin production by bik deletion mutants. Single
deletion mutants for bik1, bik2, bik3, bik4, bik5 and bik6 and the
wild-type strain IMI58289 were grown for 10 days in 10% ICI
medium. The pigmentation of cultures was documented by
photography. HPLC-DAD analyses of bikaverin (2) and
nor-bikaverin (1) production was carried out as indicated in the text