biosynthesis and regulation的用法和樣例：
例句
- The site and protein for regulation vary with breeds, which leads to the difference of the capacity of fibroin secretion in the posterior silkgland cell between breeds.
暗示了家蠶絲素分泌的過(guò)程可能受到多種蛋白的調控，不同的品種，在調控位點(diǎn)及調控蛋白上存在著(zhù)一定的差異，從而導致了不同品種家蠶后部絲腺細胞在分泌絲素能力上的差異。
