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Homocysteine is an amino acid. Amino acids are the building blocks of proteins. When proteins break down, elevated levels of amino acids like homocysteine may be found in the bloodstream. Having elevated levels of homocysteine in the blood (hyperhomocysteinemia) is associated with atherosclerosis and blood clots. It is not possible to get homocysteine from the diet. It must be made from methionine, another amino acid that is found in meat, fish, and dairy products.
The strands of fibrin form a meshwork and trap blood cells and platelets which form into a solid clot. If a blood clot forms within a healthy blood vessel it can cause serious problems. So, there are also chemicals in the blood that prevent clots from forming and chemicals that 'dissolve' clots.There is balance between forming clots and preventing clots.lotting disorders. Sometimes a blood clot forms within a blood vessel that has not been injured or cut-for example: 1  A blood clot that forms within an artery supplying blood to the heart or brain is the common cause of heart attack and stroke.