Two antigens appear to contribute to this complex and these are present consistently through larval and pupal life, but both are absent in the adult and egg. ![]() The decrease is not directly associated with the cessation of feeding since starvation does not decrease the blood protein content.The components which make up the main or "common" blood protein have been studied by immunodiffusion techniques. A cycle of change is repeated over the molting period from third to fourth instar and from fourth to fifth instar, and appears to comprise an increase in the number of protein bands in the pharate stage with a decrease immediately after ecdysis. Changes in the number of protein bands have been followed from third-instar larvae to the pupal and adult stages. The haemolymph proteins of Protoparce quinquemaculata Haworth have been studied by zone electrophoresis in starch gels.
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