Some researchers had proposed that iron-based receptors in cells found in the upper beaks of some migratory birds sense the magnetic field and send that information along a nerve to the brain.
部分专家指出：在一些候鸟上喙的细胞之中，存在铁基磁感应受体，可将磁感应信号经神经传导至大脑。
2
After tumor cell destruction, they became actively migratory, hunting for more tumor cells.
在破坏肿瘤细胞后，它们又积极迁移，捕获更多的肿瘤细胞。
3
In the absence of antigen, the t cells did not interact with tumor cells, and could not sustain an active migratory behavior within tumors.