- 4-Dihydromethyltrisporate dehydrogenase, an enzyme of the sex hormone pathway in Mucor mucedo, is constitutively transcribed but its activity is differently regulated in (+) and (-) mating types. Schimek, C., Petzold, A., Schultze, K., Wetzel, J., Wolschendorf, F., Burmester, A., Wöstemeyer, J. Fungal Genet. Biol. (2005)