这句话中what引导的是什么从句

He says that more openness in science could help to discourage whatsome perceive as a common practice of shutting out early-career scientists'requests for data.

请问这里what 引导的是什么从句？

宾语从句。这里的what非常合适根据“缩/融合性关系代词”讲解，即：what=the thing that，如此理解可能更直观更明确。在这个网站里搜索“融合性关系代词”，好了解更多的东西。