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The objective of the present study was to correlate blood grouping with nail biting. There are 160 subjects that test their blood group using general test for the identification of blood. They used antiserum A and antiserum B and antiserum D to the recognition of their blood group. If coagulation occurs in antiserum D, then its mean that the blood is positive and coagulation does not occur in antiserum D it means that blood is negative.
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