has_specified_output cell line 细胞系 establishing cell line Person: Matthew Brush 2013-4-20 MHB: For cases of initial establilshment of a line from a primary culture, successive passaging and/or selection processes can confer increasing degrees of genetic stability and compositional homogeneity as compared to the input primary culture. Historically, many texts consider the first passage as the clearest point to define the beginning of a line. However, in practice it is more often that case that more than one passage, and possibly additional selective techniques, may be required before a culture is deemed to have sufficient stability and homogeneity to be considered cell line. This is the view taken in OBI. Regardless, what is important is that some intentional, experimental step has been taken to establish a more homogenous and stable culture that can be characterized and progatated over time. establishing cell line PERSON:Matthew Brush a process whereby a new type of cell line is created, either through passaging of a primary cell culture to relative genetic stability and compositional homogeneity, or through some experimental modification of an existing cell line to produce a new line with novel characteristics (e.g. immortalization or some other stable genetic modification, or selection of some defined subset). establishing cell culture metadata complete