Abstract

The progression of fibroin in the inside of the silkgland during growth of the fifth instar was elucidated by tracing radioactive fibroin which was made of C14 glycine. Each fibroin synthesized by the posterior division at different period of the fifth instar moves, in an ordered fashion, in the inside of the gland along the middle and anterior division during growth of the silkworm. Furthermore, fibroin present in the middle division of the silkworm just before spinning is due to the successive disposition, in the order synthesized, of each portion of fibroin synthesized at different periods of the fifth stage.

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