Antibodies are host proteins that are produced by the immune system in response to foreign molecules that enter the body. These foreign molecules are called antigens, and their molecular recognition by the immune system results in selective production of antibodies that are able to bind the specific antigen.his ability of animal immune systems to produce antibodies capable of binding specifically to antigens can be harnessed to manufacture probes for detection of molecules of interest in a variety of research and diagnostic applications.
Slavery took place in many places including the Southern states in the U.S. in the 1800's and before that. Slavery has taken place since human beings stopped being hunter-gatherers.
However in other areas it is still practiced to some degree. In the US, slavery supposedly ended in 1863 with the Emancipation Proclamation signed by Abraham Lincoln, and with the passage of the 13th Amendment in 1865. But slavery still exists in several forms throughout the country, like sex trading.