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A cDNA clone encoding tyrosine hydroxylase (TH) was isolated from larval fat body of immunized Samia cynthia ricini. In naive larvae, the TH gene was expressed only in the brain, but strongly induced in fat body and hemocytes after injecting UV-killed bacteria. The induction of the gene was rather short-lived compared to that of antibacterial protein genes, reaching the maximum levels 6h after bacterial...
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