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Joined 2026-09-21 Message
Incoming links: Fetal bovine serum
HeLa Created 2026-10-14 Updated 2026-10-18
HeLa is a human continuous cell line originating in cervical cancer biological cells collected from Henrietta Lacks in 1951. Its name combines the beginning of her first and last names.[ref]
The Legacy of Henrietta Lacks (Johns Hopkins Medicine). The Legacy of Henrietta Lacks, opening history and name explanation
ATCC's CCL-2 HeLa preparation grows attached to a surface. Its product sheet specifies a cell culture medium supplemented with fetal bovine serum, at with carbon dioxide in air.[ref]
HeLa - CCL-2 by ATCC. Characteristics, Growth properties; Handling information, Complete medium, Temperature and Atmosphere
These are specified conditions for that preparation, rather than defining conditions for every HeLa derivative.Continuing access to related biological cells makes HeLa useful for comparisons of cell state and responses to interventions. But a continuous cell line is a laboratory model: its history and environment matter, and observations in it do not alone establish responses in an intact organism. Cell counting measures abundance; a trypan blue exclusion test measures a particular membrane-associated readout; neither proves cell line identity.
HeLa culture viability experiment 2026-10-18
A published teaching experiment used ATCC CCL-2 HeLa to make the distinction between a cell line and the condition of individual biological cells visible. Cultures were expanded in treated flasks and supplied as adherent dishes. A wash with phosphate-buffered saline preceded trypsin treatment to detach them; added fetal bovine serum stopped the digestion. The dispersed preparation was mixed with an equal volume of trypan blue and loaded into a counting chamber under an optical microscope.[ref]
Introducing Mammalian Cell Culture and Cell Viability Techniques in the Undergraduate Biology Laboratory by Kristen Bowey-Dellinger and others. Procedure, Materials; HeLa cell washing and dissociation; HeLa cell counting
For the ethanol comparison, treatment groups and an untreated control were brought to the same final volume; the control received phosphate-buffered saline. Dye-excluding counts were compared across replicates. The paper reports representative student measurements in Figure 3A and documents the untreated control in its discussion. Its alternative temperature comparison used three replicates per condition and a exposure.[ref]
Introducing Mammalian Cell Culture and Cell Viability Techniques in the Undergraduate Biology Laboratory by Kristen Bowey-Dellinger and others. HeLa cell viability—biology majors, volume-matched control; Figure 3A; Evidence of student learning—biology majors; HeLa cell viability—general biology education
The paper's disposable chamber had a different count-to-number density calibration from the hemocytometer above. Dye exclusion does not establish future division; recovery and mixing also affect counts. The constructed hemocytometer example is independent of those observations.[ref]