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Humans possess a powerful and intricate system of defense,
which by its very nature also carries the potential to cause injury
and disease. In most instances, a defect in immune function
is expressed in commonplace, but miserable, symptoms such as
those of hay fever and dermatitis. But abnormal or undesirable immune
functions are also actively involved in debilitating or life-threatening diseases
such as asthma, anaphylaxis, rheumatoid arthritis, graft rejection,
and cancer. |