Serological techniques have been used in systematic studies for about fifty years. At first their use was confined to those groups of animals offering plentiful supplies of blood, since blood was the tissue most widely used. Recent modifications that employ other tissues have now made possible similar study of groups of smaller animals.
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Cather, James N.
"A Serological Technique for Gastropod Taxonomy,"
Field and Laboratory: Vol. 23
Available at: https://scholar.smu.edu/fieldandlab/vol23/iss1/1