There are about 25,000 species that have been classified in the deuteromycota and many are basidiomycota or ascomycota. Fungi producing the antibiotic penicillin and those that cause athlete's foot and yeast infections are imperfect fungi. In addition, there are a number of edible imperfect fungi, including the ones that provide the distinctive characteristics of Roquefort and Camembert cheese. Some fungi which are used to develop immunosuppressant drugs, are imperfect fungi. Other imperfect fungi are used for insect pest control. 