[Incorporation of glycine and serine in sideramines of the ferrichrome type with fungi of the genus Aspergillus in vivo and in vitro (author's transl)].

A 1.6-11.8% incorporation of labelled glycine and serine into ferrichrome, ferricrocin and ferrichrysin has been achieved with four strains of Aspergillus in vivo. Cell-free extracts of Aspergillus fumigatus and A. quadricinctus capable of cyclohexa-peptide biosynthesis have been prepared.