Definition of "lymphocyte" []

• Any of the nearly colorless cells found in the blood, lymph, and lymphoid tissues, constituting approximately 25 percent of white blood cells and including B cells, which function in humoral immunity, and T cells, which function in cellular immunity. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "A protein phosphatase in the lymphocyte is activated (when contacting the antigen-presenting cell)"
• "A '' 'lymphocyte' '' is a cell that belongs to group of [[white blood cell]] s (i.e., leukocytes), which are a major component of the immune system."
• "Cellular assays include immunophenotyping of specific cell populations as well as assays for lymphocyte and phagocyte function."