(cytology) A cell of the nervous system which conducts nerve impulses; a neuron.

(cytology) The semipermeable membrane that surrounds the cytoplasm of a cell.

(cytology) A cell that produces something, such as a fibroblast or osteoblast. / An undifferentiated or immature cell.

(medicine, cytology) A primal undifferentiated cell from which a variety of other cells can develop through the process of cellular differentiation.

(energy) An electrochemical device in which the intrinsic chemical free energy of fuel and oxidant is catalytically converted to direct current energy.

(cytology) A thick, fairly rigid, layer formed around individual cells of bacteria, Archaea, fungi, plants, and algae (but not animals and other protists which generally have cell membranes without cell walls). The cell wall is external to the cell membrane and serves a structural function helping the cell maintain its shape and protecting the cell from damage.

(immunology) A lymphocyte, from the thymus, that can recognise specific antigens and can activate or deactivate other immune cells.

(genetics) A biological tissue or group of individual cells that are genetically identical as a result of dividing mitotically from a single progenitor cell.

(biology) The scientific theory that all living organisms are made of cells as the smallest functional unit.

(immunology) A form of B cell that produces antibodies after having reacted with its specific antigen in follicle centers.