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Enhancing antibodies
Antibodies which enhance the survival of a graft or of a tumor.
Enzyme-linked immunosorbent assay (ELISA)
An assay in which an enzyme is linked to an antibody and a colored substrate is used to measure the activity of bound enzyme and, hence, the amount of bound antibody.
Eosinophil
A polymorphonuclear leukocyte with large eosinophilic (i.e. red) cytoplasmic granules.
Eosinophil chemotactic factor of anaphylaxis (ECF-A)
A substrate released from mast cells during anaphylaxis which attracts eosinophils.
Epitope
An alternative term for antigenic determinant.
Equivalence zone
In a precipitin reaction, the region in which the concentration of antigen and antibody leads to maximal precipitation.
Exon
The region of DNA coding for a protein or a segment of a protein.
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