Primary cell cultures can be established from tissue explants or, more usually, from disaggregated tissue samples. Cells that can be subcultured many times are called cell lines and examples have been isolated from diverse tissues and cell types. Continuous cell lines of unlimited lifespan can be generated by means of a number of immortalization techniques, although in most cases such cell lines have arisen spontaneously.
Keywords: primary cells; cell lines; immortalization; in vitro cell culture; standardization






