Major haemolymph proteins inCeratitis capitata: Biosynthesis and secretion during development

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Abstract
The accumulation of major haemolymph proteins (a group of proteins immunologically related to Calliphorin) their biosynthesis in vivo and in organ culture as well as their secretion, has been studied during the late larval stages and white pupae of the Mediterranean fruit flyCeratitis capitata. The accumulation of major haemolymph proteins in the haemolymph, shows a twenty fold increase from the 4-day old larvae to the white pupae stage, while in the fat body there is only a seven fold increase. It is evident from the in vivo and organ culture studies, that the major haemolymph proteins are synthesized during the late larval stage and their synthesis declines abruptly during the stage of white pupae. It seems also that each polypeptide has its own characteristic developmental kinetics of synthesis. The major haemolymph proteins are synthesized in the fat body and are very quickly secreted into the haemolymph.

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