In forensic serology, the antisera used in precipitin tests to determine the species origin of a bloodstain mainly contain antibodies of which immunoglobulin class?

Antisera raised for precipitin tests consist mainly of IgG, the most abundant circulating immunoglobulin and the class that dominates the secondary response to repeated immunisation, which forms the visible antigen-antibody precipitate. IgM is a large pentamer best known for agglutination and is present in smaller amounts, while IgA and IgE are minor serum classes serving mucosal and allergic responses.