They're synthesized, they're packaged into vesicles, and then they're just waiting.

神经递质不断合成 包装进小泡中,时刻准备着

耶鲁公开课 - 生物医学工程探索课程节选

Some of them are changes in the - not the sequence of DNA, not the sequence of nucleotides in the DNA but the chemistry of DNA around that the way that it's packed into a nucleus.

某些改变不是发生在DNA序列上,不是在DNA的核苷酸序列上,而是发生在DNA包装进细胞核的,一系列化学变化中

耶鲁公开课 - 生物医学工程探索课程节选