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Gene targeting in the silkworm. Shown here are isolated silk glands from control (left) and transgenic Bombyx mori larvae (right) under exposure to UV light. The transgenic larva contains an L-chain-GFP fusion under the control of the L-chain promoter. Fibroin L chain is one of the major protein components of silk. (For details, see Yamao et al., p. 511.)