Examlex
Which of the following can be a barrier to entry, closing a market to new firms?
Antibodies
Proteins produced by the immune system that recognize and bind to specific antigens, such as bacteria or viruses, to neutralize or destroy them.
B Cells
A type of white blood cell that plays a key role in the immune response by producing antibodies to neutralize pathogens.
Red Blood Cell
A cell that carries oxygen from the lungs to the body's tissues and returns carbon dioxide from the tissues back to the lungs.
Abbreviation
An abbreviation is a shortened form of a word or phrase used to save space or avoid repetition.
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