has_specified_input has_specified_input has_specified_output has_specified_output achieves_planned_objective portioning objective cultured cell population material component separation cell culture splitting An active cell culture is typically split when it has grown to confluence in its culture dish. Cell culture splitting of a cell culture sample results in an increase in its passage number, which measures how long a sample has been propagated in vitro, and therefore how many selective or genetic changes it is likely to have undergone. OBI branch derived PlanAndPlannedProcess Branch The act of taking a cell culture of high density, counting the cells, removing part of the cells, and re-seeding a select number of the cells into new flasks with fresh tissue culture media. The act of taking part of a homogeneous cell culture and creating one or more additional separate cultures of similar qualities. input: cell_culture, output cell_culture min cardinality 2. part of cell culturing cell culture passaging cell culture splitting pending final vetting