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Insect cuticular melanization is a defense mechanism involving the prophenoloxidase (proPO)-activating system. Here, we showed the differential regulation of tyrosine hydroxylase in silkworm (Bombyx mori) pupae. B. mori tyrosine hydroxylase (BmTH) was expressed in the epidermis during development or in the fat body during infection, which indicates that the differential expression of BmTH is responsible...
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