Abstract
Larval serum proteins (LSPs) 1 and 2 of Drosophila melanogaster have been shown to accumulate in third instar larval haemolymph ( Roberts et al., 1977). In the present paper the major third instar larval tissues have been assayed for LSP synthesis. Polypeptides radiolabelled in organ culture have been analyzed by SDS-polyacrylamide gel electrophoresis and by immunoelectrophoresis. Fat body was shown to be the major source of LSPs 1 and 2 and the two proteins were synthesized by all regions of third instar fat body.
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