To ATCC Valued Customers,

ATCC stands ready to support our customers’ needs during the coronavirus pandemic. If you experience any issues with your products or services, please contact ATCC Customer Service at For Technical questions please contact Thank you.

Privacy Policy Update

We remain dedicated to protecting your data and experience throughout our platforms. We have updated our Privacy Policy and your continued use of the Site means you have accepted the revised Privacy Policy. View now >

Primary Epidermal Keratinocytes; Normal, Human, Neonatal Foreskin (HEKn) (ATCC® PCS-200-010)

Organism: Homo sapiens, human  /  Tissue: Skin  /  Cell Type: Keratinocyte

Permits and Restrictions

View Permits

Organism Homo sapiens, human
Tissue Skin
Cell Type Keratinocyte
Morphology Cobblestone appearance; cells are rounded, not flat; cells display a high mitotic index; at near 80% confluence, the cells will be associated with each other in colonies.
Growth Properties Adherent
Biosafety Level 1

[These primary cells are not known to harbor an agent recognized to cause disease in healthy adult humans. Handle as a potentially biohazardous material under at least Biosafety Level 1 containment. Cells derived from primate lymphoid tissue may fall under the regulations of 29 CFR 1910.1030 Bloodborne Pathogens.  

ATCC recommends that appropriate safety procedures be used when handling all primary cells and cell lines, especially those derived from human or other primate material. Detailed discussions of laboratory safety procedures are provided in Laboratory Safety: Principles and Practice, 2nd ed. (ASM Press, Washington, DC) (Fleming et al., 1995) and Caputo, J.L. Biosafety procedures in cell culture. (1988) J. Tissue Culture Methods 11:223.

Appropriate safety procedures should always be used with this material. Laboratory safety is discussed in the following publication: Biosafety in Microbiological and Biomedical Laboratories, 5th ed. HHS Publication No. (CDC) 93-8395. U.S. Department of Health and Human Services, Centers for Disease Control and Prevention. Washington DC: U.S. Government Printing Office; 2007. The entire text is available online at]

Human Material Precaution 

All tissues used for isolation are obtained under informed consent and conform to HIPAA standards to protect the privacy of the donor’s personal health information. It is best to use caution when handling any human cells. We recommend that all human cells be accorded the same level of biosafety consideration as cells known to carry HIV. With infectious virus assays or viral antigen assays, even a negative test result may leave open the possible existence of a latent viral genome.

Biosafety classification is based on U.S. Public Health Service Guidelines, it is the responsibility of the customer to ensure that their facilities comply with biosafety regulations for their own country.

Disease Normal
Age Neonatal
Gender Male
Toxicology, wound repair, skin cancer, response to UV radiation, psoriasis, eczema, viral infection, gene delivery systems, cellular differentiation
Product Format frozen 1 mL
Storage Conditions -130°C or below
Images Primary Keratinocytes 11 Day Differentiation
A complete solution to propagate neonatal keratinocytes. The serum-free media is formulated to inhibit fibroblast growth, and the low calcium concentration (60 µM) slows differentiation. No feeder layers, extracellular matrix proteins or other substrates are required.
Complete Growth Medium
  1. Obtain one Keratinocyte Growth Kit from the freezer; make sure that the caps of all components are tight.
  2. Thaw the components of the growth kit just prior to adding them to the basal medium. It is necessary to warm the L-glutamine component in a 37°C water bath and shake to dissolve any precipitates prior to adding to the basal medium.
  3. Obtain one bottle of Dermal Cell Basal Medium (485 mL) from cold storage.
  4. Decontaminate the external surfaces of all growth kit component vials and the basal medium bottle by spraying them with 70% ethanol. 
  5. Using aseptic technique and working in a laminar flow hood or biosafety cabinet, transfer the indicated volume of each growth kit component, as indicated in Table 1, to the bottle of basal medium using a separate sterile pipette for each transfer.
  6.        Table 1. Keratinocyte Growth Kit Components 



    Final Concentration

    Bovine Pituitary Extract (BPE)

    2.0 mL


    rh TGF-a

    0.5 mL

    0.5 ng/mL


    15.0 mL

    6 mM

    Hydrocortisone Hemisuccinate

    0.5 mL

    100 ng/mL

    rh Insulin

    0.5 mL

    5 mg/ml


    0.5 mL

    1.0 mM


    0.5 mL

    5 mg/ml


    Antimicrobials and phenol red are not required for proliferation but may be added if desired. The recommended volume of either of the optional components (GA solution or PSA solution) to be added to the complete growth media is summarized in Table 2.


    Table 2. Addition of Antimicrobials/Antimycotics and Phenol Red (Optional)



    Final Concentration

    Gentamicin-Amphotericin B Solution

    0.5 mL

    Gentamicin: 10 µg/mL

    Amphotericin B: 0.25 µg/mL

    Penicillin-Streptomycin-Amphotericin B Solution

    0.5 mL

    Penicillin: 10 Units/mL

    Streptomycin: 10 µg/mL

    Amphotericin B: 25 ng/mL

    Phenol Red

    0.5 mL

    33 µM

  7. Tightly cap the bottle of complete growth medium and swirl the contents gently to assure a homogeneous solution. Do not shake forcefully to avoid foaming. Label and date the bottle.
  8. Complete growth media should be stored in the dark at 2°C to 8°C (do not freeze). When stored under these conditions, complete growth media is stable for 30 days.
  1. Passage normal keratinocytes when the culture has reached approximately 70% to 80% confluence.
  2. Warm both the Trypsin-EDTA for Primary Cells (ATCC PCS-999-003) and the Trypsin Neutralizing Solution (ATCC PCS-999-004) to room temperature prior to dissociation. Warm the complete growth medium to 37°C prior to use with the cells.
  3. For each flask, carefully aspirate the spent media without disturbing the monolayer.
  4. Rinse the cell layer one time with 3 to 5 mL D-PBS (ATCC 30-2200) to remove residual medium.
  5. Add pre-warmed trypsin-EDTA solution (1 to 2 mL for every 25 cm2) to each flask.
  6. Gently rock each flask to ensure complete coverage of the trypsin-EDTA solution over the cells, and then aspirate the excess fluid off of the monolayer.
  7. Observe the cells under the microscope. When the cells pull away from each other and round up (typically within 3 to 6 minutes), remove the flask from the microscope and gently tap it from several sides to promote detachment of the cells from the flask surface. If cells are difficult to detach, incubate each flask containing cells and the trypsin-EDTA solution at 37°C to facilitate dispersal.
  8. When the majority of cells appear to have detached, quickly add an equal volume of the Trypsin Neutralizing Solution (ATCC PCS-999-004) to each flask. Gently pipette or swirl the culture to ensure all of the trypsin-EDTA solution has been neutralized.
  9. Transfer the dissociated cells to a sterile centrifuge tube and set aside while processing any remaining cells in the culture flask.
  10. Add 3 to 5 mL D-PBS (ATCC 30-2200) to the tissue culture flask to collect any additional cells that might have been left behind. 
  11. Transfer the cell/D-PBS suspension to the centrifuge tube containing the trypsin-EDTA-dissociated cells.
  12. Repeat steps 10 and 11 as needed until all cells have been collected from the flask.
  13. Centrifuge the cells at 150 x g for 3 to 5 minutes.
  14. Aspirate neutralized dissociation solution from the cell pellet and resuspend the cells in 2 to 8 mL fresh, pre-warmed, complete growth medium.
  15. Count the cells and seed new culture flasks at a density of 2,500 to 5,000 cells per cm2.
  16. Place newly seeded flasks in a 37°C, 5% CO2 incubator for at least 24 to 48 hours before processing the cells further. Refer to Maintenance for guidelines on feeding.
Volume 1 mL
Cells per Vial One vial contains a minimum of 5 x 105  viable cells.
Sterility Tests
Bacteria and Yeast: Negative
Mycoplasma: Negative
Viral Testing
Hepatitis B: Negative
Hepatitis C: Negative
HIV: Negative
Viability ≥70% when thawed from cryopreservation
C of A
Certificate of Analysis
Certificate of Analysis
Notice: Necessary PermitsPermits

These permits may be required for shipping this product:

  • Customers located in the state of Hawaii will need to contact the Hawaii Department of Agriculture to determine if an Import Permit is required. A copy of the permit or documentation that a permit is not required must be sent to ATCC in advance of shipment.
Basic Documentation
Other Documentation

Ji C, et al. Ultra-violet B (UVB)-induced skin cell death occurs through a cyclophilin D intrinsic signaling pathway, Biochem Biophys Res Commun 425(4):825-9, 2012. PubMed: 22892127

Andries O, et al. N(1)-Methylpseudouridine-Incorporated mRNA Outperforms Pseudouridine-Incorporated mRNA by Providing Enhanced Protein Expression and Reduced Immunogenicity in Mammalian Cell Lines and Mice. J Control Release 217(217):337-44, 2015. PubMed: 26342664

Pollen AA, et al. Low-Coverage Single-Cell mRNA Sequencing Reveals Cellular Heterogeneity and Activated Signaling Pathways in Developing Cerebral Cortex. Nat Biotechnol 32.10(32):1053-8, 2014. PubMed: 25086649

Zhou, C, et al. High Water Content Hydrogel with Super High Refractive Index. Macromol Biosci, 13.11(13):1485-91, 2013. PubMed: 23881874

Merrilees MJ, et al. Use of Versican Variant V3 and Versican Antisense Expression to Engineer Cultured Human Skin Containing Increased Content of Insoluble Elastin. J Tissue Eng Regen Med 11.1(11):295-305, 2017. PubMed: 24945362

Eichner A, et al. Fast and Effective Inactivation of Bacillus Atrophaeus Endospores Using Light-Activated Derivatives of Vitamin B2. Photochem Photobiol Sci 14.2(14):387-96, 2015. PubMed: 25423452

Choi SK, et al. Integrin-Binding Elastin-Like Polypeptide as an in Situ Gelling Delivery Matrix Enhances the Therapeutic Efficacy of Adipose Stem Cells in Healing Full-Thickness Cutaneous Wounds. J Control Release 237(237):89-100, 2016. PubMed: 27393655

Diaz LAC, et al. Ascorbic Acid, Ultraviolet C Rays, and Glucose but not Hyperthermia Are Elicitors of Human b-Defensin 1 mRNA in Normal Keratinocytes. BioMed Research International 2015(714580):9, 2015. DOI: 10.1155/2015/714580

Maliniemi, P, et al. Nav3 Copy Number Changes and Target Genes in Basal and Squamous Cell Cancers. Exp Dermatol, 20.11(20):926-31, 2011. PubMed: 21995814

Roma-Rodrigues C, et al. Infection of Human Keratinocytes by Streptococcus Dysgalactiae Subspecies Dysgalactiae Isolated from Milk of the Bovine Udder. Microbes Infect 18.4(18):290-3, 2016. PubMed: 26655883