<prompt> The vitamin present in the fatty acid synthase complex isThiamineFolatePantothenatePyridoxine  <response>: Fatty acid synthase: In yeast, mammals, and birds, the synthetase enzyme system is called the fatty acid synthase complex--it is a multienzyme complex. It is made up of an ellipsoid dimer of two identical polypeptide monomeric units monomer I and II, arranged in a head to tail fashion. Each monomeric unit contains six enzymes and an ACP molecule Acyl carrier protein. Active Site The ACP has an -SH group in the 4-phosphopantetheine moiety, referred as Pantothenic-SH Pan-SH Another active -SH group present in the cysteine moiety of the enzyme ketoacyl synthase condensing enzyme, referred as cysteinyl-SH Cys-SH. The Pan-SH of one monomeric unit is in close proximity to the Cys-SH group of other monomeric unit and vice-versa.Ref: MN Chatterjea Textbook of Medical Biochemistry, 8th edition, page no: 414 