中部丝腺中丝胶蛋白的大量合成，是在五龄5日以后，以熟前一日合成活性最高。
A large amount of sericin protein was synthesized after the 5th day of the last instar and its synthetic activity was the highest on the last day of the 5th instar.
奥秘在于丝腺里的水分逐步流失，而蛋白质可以储存水分，蚕在吐丝前先溶解于水。
The answer lies in the silkworm's slowly decreasing the water content in its silk glands and in the proteins' ability to retain water, keeping the solution soluble up until it is spun.
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