Aspects of this topic are discussed in the following places at Britannica.
...one antibody in abundance. Another method of obtaining large amounts of a specific antibody is by fusing a B lymphocyte with a rapidly growing cancer cell. The resultant hybrid cell, known as a hybridoma, multiplies rapidly in culture. Since the antibodies obtained from hybridomas are produced by clones derived from a single lymphocyte, they are called monoclonal antibodies.
...results in a remarkable hybrid cell that produces the antibody made by its B-cell component but retains the capacity of its myeloma component to multiply indefinitely. Such a hybrid cell is called a hybridoma.
...(see figure). The procedure involves fusing long-lived myeloma cells that do not produce antibodies with short-lived plasma cells that produce a specific antibody. The resulting hybrid cells, called hybridomas, combine the longevity of the myeloma cell with the ability to produce a specific antibody and so are able to produce potentially unlimited amounts of the desired antibody. Monoclonal...
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