In one aspect of the invention, a retainer is applied to a body part such as the skin or mucous membrane of a patient, and one or more first step antibodies are brought into contact with {HEAD ~ the body part} within {TAIL ~ the confines} of the retainer 
In one aspect of the invention , a retainer is applied to a body part such as the skin or mucous membrane of a patient , and one or more first step antibodies are brought into contact with { HEAD ~ the body part } within { TAIL ~ the confines } of the retainer
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