covalent extension的用法和樣例：
例句
- Additionally, covalent modifications have effect on the mobility of some proteins.
另外蛋白質(zhì)的共價(jià)修飾可對某些蛋白質(zhì)的運動(dòng)產(chǎn)生影響。 - Histone is the nucleus of chromatin, the covalent modifications in its tails form the histone codes that regulate a number of biological processes.
組蛋白是染色質(zhì)的核心，其尾部的共價(jià)修飾組成組蛋白密碼，調節許多生物學(xué)事件。
