primary cultured cell BTO:0002290 Covers cells actively being cultured or stored in a quiescent state for future use. https://cellxgene.cziscience.com/cellguide/CL_0000001 unpassaged cultured cell primary cell line cell primary cell culture cell Primary cultured cells are cells directly extracted from living organisms and then cultivated in a laboratory under controlled environmental conditions. After extraction, these cells can grow and reproduce when provided with the appropriate nutrients. The establishment of primary cell cultures involves processes like tissue dissection, enzymatic or mechanical disaggregation, suspension, and plating. These cells closely mimic the biochemical and physiological conditions of cells in vivo, providing a more realistic model of biological function compared to other cell culture systems. Retaining most physiological and morphological characteristics of the original tissue, primary cultured cells are a powerful tool for modeling diseases, drug responses, and basic biological functions such as synthesis and metabolism. They find extensive use in research fields such as cellular biology, genetics, pharmacology, oncology, and toxicology. Despite their genetic stability, primary cultured cells have a finite lifespan and are not immortal. They undergo senescence after a specific number of population doublings, influenced by genetic, environmental, and epigenetic factors. Given their limited lifespan, primary cells are crucial for experimental replicability, and their cultivation demands meticulous care to prevent changes that might alter cell identity or function. (This extended description was generated by ChatGPT and reviewed by the CellGuide team, who added references, and by the CL editors, who approved it for inclusion in CL. It may contain information that applies only to some subtypes and species, and so should not be considered definitional.) A cultured cell that is freshly isolated from a organismal source, or derives in culture from such a cell prior to the culture being passaged. cultured cell