<prompt> All the vitamins are carried by proteins than Not-co transport EXCEPTNiacinRiboflavinThiamineCyanocobalamine  <response>: Riboflavin 168-R. S 7thRIBOFLAVIN B2 - Riboflavin through its coenzyme FMN and FAD takes part in a variety of cellular oxidation-reduction reaction The flavin coenzymes mostly FAD and lesser extent FMN participate in many redox reactions responsible for energy production. Enzymes that use flavin coenzymes FMN or FAD are called flavoproteins Galactoflavin is an antimetabolite of riboflavin FMN and FAD acts as coenzyme in various H-transfer reactions in metabolism- The hydrogen is transported by reversible reduction of the coenzyme by two hydrogen atoms added to the N at position 1 and 10, thus forming dihydro or leucoriboflavin 161- Rana Shinde 6thNIACIN Nicotinic acid, P. P. factor The coenzymes NAD and NADP operate as hydrogen and electron transfer agents by virtue of reversible oxidation and reduction 60 mg of tryptophan can give rise to 1 mg of Niacin High pellagra is more common in persons who staple diet is maizeTHIAMINE B1 anti beri-beri or antineuritic vitamin It has a specific coenzyme thiamine pyrophosphate TPP which is mostly associated with carbohydrate metabolismCYANOCOBALAMINE B12 Anti pernicious anemia factor, extrinsic factor of castle, Animal protein factor There are two coenzyme forms of B12 a 5-Deoxyadenosyl cobalamine, b Methylcobalamine Biologically active forms are cobamide coenzymes act, as coenzyme with various enzymes. Cobamide coenzyme do not contain the cyano- group attached to cobalt but instead there is an Adeninine Nucleoside, which is linked to cobalt by a C-CO bond.Transcobalamine 1Transcobalamine II1. Source-probably Leucocytes increased in myelo proliferative states2. Plasma level 60 mgL1. Source is Liver2. Plasma level 20 mgL 