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cells that remember specific antigens.
a form of asexual reproduction. It is an unequal cell division, in which a small cell forms...
a chemical messenger produced and released by a cell or a gland in one part of the body of the...
a group or category in the biological classification system (the plural of taxon is taxa).
an alkaline watery fluid containing digestive enzymes, which is secreted into the mouth by...
a kingdom of plant-like unicellular and multicellular organisms that do not contain chlorophyll...