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 the social, economic, and legal position of slaves was vastly different in different systems of slavery in different times and places. Slavery can be traced back to the earliest records, such as the Code of Hammurabi (c. 1760 BC), which refers to it as an established institution. Slavery is rare among hunter-gatherer populations, as it is developed as a system of social stratification.