The cyclosporins are a group of macrolides isolated from fungi and used as immunosuppresant drugs, for example after transplant surgery. They are nonribosomal peptide synthesized by cyclosporin synthetase. Cyclosporin A (ciclosporin) Cyclosporin B Cyclosporin C Cyclosporin D Cyclosporin E Cyclosporin F Cyclosporin G References Cyclic peptides Immunosuppressants Fungi and humans