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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/article/human-cell-f086b416e1a45d80

A human cell is a tiny container of chemicals, making it the basic building block of all human life. There are trillions of cells in a human being, and they determine the structure and function of each person.

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/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/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/science/function-plant-cell-ea580b8541b7bf77

As the basic living part of a plant, the plant cell is involved in many physiological and structural activities. They range from synthesis of proteins and energy to maintaining structural integrity and tautness.

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.

www.reference.com/article/human-cells-cell-walls-1803b9804007ee1a

Human cells do not have cell walls. Cell walls are multilayered structures that are unique to plants, bacteria, fungi and some protozoa. However, only plant cell walls are made out of cellulose.

www.reference.com/article/animal-cells-cell-wall-b60fadd7c6dc1f73

Animal cells do not have a cell wall. Instead, animal cells have a cell membrane that protects the organelles inside of the cell and allows selective compounds to move in and out of the cell.

www.reference.com/article/one-cell-become-brain-cell-another-skin-cell-f83f01f3dd7bcefc

In an embryo, one cell becomes a brain cell and another a skin cell through the process called cell differentiation, which involves changes in gene expression. The genome stays the same in each specialized cell, while each cell has a different structure and functions.