So, this is called the extracellular region or domain, this is the trans-membrane region or domain, and this is the cytoplasmic region or domain.
因此,这部分叫做胞外区,中间这部分叫做跨膜区,内部这一段叫做胞质区
Then there's a part that's inside the cell sticking down into the cell cytoplasm.
然后还有部分穿过质膜,进入细胞内部,与细胞质相接触
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