... proteins, such as albumin, but no clotting factor, therefore proteins from one animal are foreign to an animal of a different species. Such proteins therefore act as antigens in the other animal's body, and that animal produces antibodies to try to attack the antigen. If the sensitised serum containing the antibodies is then extracted from the animal, and recombined with the original protein, the antibodies react against the protein forming a precipitate. This experiment can be performed with rabbits in the following way. Blood sample taken from human Blood cells separated from plasma Serum from human is injected into the rabbit, and rabbit subsequently develops antibodies to human serum A blood sample is the taken from the rabbit and separated to produce sensitised rabbit serum This sensitised rabbit serum is then reacted with serum from other animals The level of precipitation is recorded. A large amount of precipitate indicates that the two species are closely ...

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