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www.reference.com/science/definition-plant-cell-5628cdd2fb639ef5

A plant cell is the structural and functional unit of a plant. Plant cells generally form several different colonies in order to become a higher functioning organism.

www.reference.com/article/definition-stem-cells-24a7ab4235042ffc

Stem cells are cells that have not yet differentiated into a specific type of cell. Several types of stem cells with different characteristics are currently available for use in the medical field.

www.reference.com/science/definition-cell-elongation-8de67fe6fb0ddf4d

Cell elongation is the lengthening of a cell during the cell differentiation process in the growth of a new organism or during movement in mature plants. Cell elongation occurs in both plants and animals.

www.reference.com/science/function-t-cells-56815f6baa741252

The function of T cells is to perform a variety of immune responses in the body, according to National Multiple Sclerosis Society. T cells are one of two types of white blood cells that help immune function.

www.reference.com/article/many-t-cells-people-normally-56865b71ecaf766f

There are normally between 500 and 1,000 T-cells per cubic millimeter of blood, according to AIDS.gov. T-cells send signals that activate the body's immune response when there are viruses or bacteria in the body.

www.reference.com/science/types-cells-animal-cells-74972601835ea42a

Animal cells are eukaryotic cells, or cells that contain a membrane-bound nucleus. The nucleus holds the DNA of the cell that provides the cell with instructions for life.

www.reference.com/article/meaning-t-cell-count-db2671e5d46ecc53

T-cell count is the blood test that measures the number of the lymphocytes, a type of white blood cell in the human body. Since these cells work to fight off diseases, a low or high T-cell count means the immune system is compromised, notes Healthline.