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Allergy skin testing.

Allergy skin testing.
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Description: This patient’s forearm shows a number of wheals where the body’s immune response was triggered by the injected antigen. The size of the wheal corresponds to the degree of allergy to that antigen. No wheal formation means that the patient is not allergic to that antigen.  
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Views: 750
Filesize: 144.23kB
Height: 1415 Width: 2125
Source: https://biology-forums.com/index.php?action=gallery;sa=view;id=13374
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