怎么判断which指代前面整个句子

which前面有逗号隔开,就是说主句和从句间有个逗号,这样的从句叫非限制定语从句.表示一个词是没有逗号隔开的叫限制性定语从句啊。which suppresses theincreased number of primary neurons in DAPT-treated embryos.这个是从句啊，由which 引导啊，主句是The reduction of Notch signalling in zebrafish could berescued in part by microinjection of NICD mRNA。一个句子谓语只能有一个。