Antibodies look like this, they're big proteins, if you looked at them under a microscope or if you looked at them in cartoons they're shaped like the letter Y.

抗体看起来就像这样,它们是大型蛋白,如果你用显微镜观察抗体,或者从图上看的话,它们都呈字母Y形

耶鲁公开课 - 生物医学工程探索课程节选