This is a complex process that requires molecular feedback between neural stem cells and microglial cells, which release and express a multitude of molecules.
which指代的是process还是microglial cells?
非限制性定语从句的 which, 应指代 neural stem cells and microglial cells(神经干细胞和小胶质细胞)。
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process是不可能发出release and express这样的动作的,予以排除。which的先行词为前面的名词microglial cells。