... rotene,neurosporene and lycopene, and two copies of the enzymelycopene cyclase, which covert ®rst lycopene into c- carotene and then c- carotene into b-carotene. So far,no molecular evidence for such an enzymatic ... group of mutantsaltered in t his bifunctional gene has been described for bothZygomycetes. In Phycomyces they complement neither the carR nor the carA mutants, and i n Mucor they complementneither ... the regulation of the carotenoid pathway in Mucor seems tobe different from that in Phycomyces [12,13]. The fungus Phycomyces remains m ultinucleate through-out the cell cycle. The mycelia are large coenocytescontaining...