<prompt> All are involved in non toxic transport of ammonia except:Glutamine synthetaseGlutaminaseAlanine cycleSGPT  <response>: Transport of Ammonia Free ammonia is toxic to cells especially to brain. Excess ammonia generated has to be converted to nontoxic form then transported to liver to enter into urea cycle.Transport of Ammonia from most of the tissues including the brainTransport of Ammonia from skeletal muscleTransport of Ammonia from most of the tissues including the brain.As Glutamine with the help of the enzyme Glutamine Synthetase.Glutamine SynthetaseAmmonia formed in most tissues including the brain is trapped by Glutamate to form GlutamineThis is called first line trapping of ammoniaATP is required for this reaction.GlutaminaseIn the liver, glutaminase removes the ammonia from Glutamine.Ammonia enter into urea cycle in the liver.Transport of Ammonia from skeletal muscle.From Skeletal Muscle as AlanineIn skeletal muscle, excess amino groups are generally transferred to pyruvate to form alanine.Key Concept:Glutamine synthase converts NH3 to nontoxic glutamine. Glutaminase releases NH3 for use in urea synthesis. 