...antibodies can be isotype-specific or even isotype subclass-specific. This specificity can be used to ensure...Isotype Description Configuration and Valency Subclasses IgA Prevalent antibody in secretions (e.g. tears...should never be stored below 4 °C. Certain isotype subclasses, such as IgG3, aggregate after thawing and therefore...different species of origin, isotypes, and isotype subclasses of a primary antibody, which becomes the limiting...? You may need to buy isotype-specific or even subclass-specific secondary antibodies to allow for differentiation...