Cell generation time
The interval between the beginning of consecutive divisions of a cell. The time that it takes for a population of single-celled organisms to double its cell number. Successive generations of cells or organisms within a population are separated by a time interval called generation time. The cell regeneration time can be determined with the aid of time –lapse microcinematography.

Cell- mediated immune response
The activation of T cells of the immune system in response to the presence of a foreign antigen.

Cell membrane
The membrane that separates the cell wall and the cytoplasm, and regulates the flow of material and out of the cell. See plasmalemma

Cell number
The number of cells per unit volume of a culture.

Cell plate
The precursor of the cell wall, formed as cytokinesis starts during cell division. The cell plate develops in the region of the equatorial plate and arises from membranes in the cytoplasm

Cell sap
Water and dissolved substances, sugar, amino, acids, waste, substances, etc., in the plant cell vacuole.

Cell selection
The process of selecting cells within a group of genetically different cells. Select cells or cell lines are sub-cultured onto fresh medium for continued selection and often are exposed to an increased level of the selection agent. The final objective is to regenerate plants exhibiting the traits selected for at the cellular level.