A novel fermentation fed batch process for producing the immunosuppressant, Tacrolimus (FK-506), using the mutant microorganism Streptomyces sp. Utilizing vegetative oil as sole source of carbon in production medium, is provided herewith. Drawing Sheets: NIL Total Pages: 14 Fig. Nil 0 CONCORD BIOTECH LIMITED Address of the Applicant: 302, SAKAR-III, OPPOSITE OLD HIGH COURT, I.T.O CIRCLE, ASHRAM ROAD, AHMEDABAD 380 014. 801/MUM/2004 801/MUM/2004 INDIA 2009-03-27T15:55:30Z 2006-10-27 2004-07-29 424115 C12P 17/14 C12R 1/465 NIL 17912 0 97 NIL NIL 2006-10-27 0 1fgLmjSv 2009-04-30T18:56:27Z 19940 CONCORD BIOTECH 801/MUM/2004 44413 2007-08-10 208212 CONCORD BIOTECH LIMITED xNRfnVz