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Yolk proteins in Drosophila: identification and site of synthesis.

The yolk proteins from several Drosophila species were identified and partially purified. One or two predominant proteins were found in the crude extracts of mature oocytes and in the hemolymph of mature females. They were absent or present in trace amounts in male and young female hemolymph. Fat body from mature D. silvestris cultured in Grace's insect culture medium, synthesized and released several proteins, two of which were precipitable by antibodies against silvestris crude yolk extract. Fat body from immature flies synthesized and released only one of these proteins.