In posterior part of middle silkgland cells, 10, 7, and 25 especial protein spots were found out in 2(superscript nd) day, in 4(superscript th) day and in the mature stage, respectively.

• 后部区段5龄第2天表达的特异性蛋白质斑点有10个，第4天有7个，熟蚕期有25个。