Antibody

An antibody is a protein component of the immune system that circulates in the blood, recognizes foreign substances like bacteria and viruses, and neutralizes them. After exposure to a foreign substance, called an antigen, antibodies continue to circulate in the blood, providing protection against future exposures to that antigen.

Antibody is a part of the host cell’s defense. It’s made by a certain type of white blood cell that’s called a B cell. The structure of the antibody consists of two light chains and two heavy chains, and at the very tip of the antibody is a hypervariable region, and this hypervariable region allows the antibody to make different types of antibodies that will respond to all of the antigens that will assault the body. An antigen is anything that is foreign to the human body. It can be a virus, it can be a bacteria, and in some cases your own body will appear as foreign. And so you can have in certain instances where your own body will make antibodies against parts that are part of you.

抗體是免疫系統的一種蛋白質成分，它在血液中循環，識別細菌和病毒等外來物質併中和它們。在暴露於稱為抗原的外來物質後，抗體會繼續在血液中循環，從而防止未來暴露於該抗原。
抗體是宿主細胞防禦的一部分。它是由一種稱為 B 細胞的白細胞製成的。抗體的結構由兩條輕鍊和兩條重鏈組成，在抗體的最末端是一個高變區，這個高變區允許抗體產生不同類型的抗體，這些抗體將對所有抗原產生反應會攻擊身體。抗原是對人體來說是外來的任何東西。它可以是病毒，也可以是細菌，在某些情況下，您自己的身體會顯得像異物。因此，在某些情況下，您自己的身體會產生針對您身體一部分的抗體。