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Hot Products
- In-Stock Tumor Cell Lines
- Human Orbital Fibroblasts
- Human Microglia
- Human Pulmonary Alveolar Epithelial Cells
- Human Colonic Fibroblasts
- Human Type II Alveolar Epithelial Cells
- Human Valvular Interstitial Cells
- Human Thyroid Epithelial Cells
- C57BL/6 Mouse Dermal Fibroblasts
- Human Alveolar Macrophages
- Human Dermal Fibroblasts, Adult
- Human Lung Fibroblasts, Adult
- Human Retinal Muller Cells
- Human Articular Chondrocytes
- Human Retinal Pigment Epithelial Cells
- Human Pancreatic Islets of Langerhans Cells
- Human Kidney Podocyte Cells
- Human Renal Proximal Tubule Cells
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Which passage of stem cells is suitable for applications?
In theory, earlier passages retain stronger stemness. However, during in vitro culture, stem cells undergo adaptation from their tissue microenvironment to the culture conditions, and cells that fail to adapt are eliminated. In the first two to three passages, the genome may be unstable, making these cells less suitable for clinical use. Studies have shown a higher proportion of abnormal karyotypes in early passages. For example, for mesenchymal stem cells (MSCs), the optimal passage range for clinical applications is generally between passages 4 and 6.
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How can the functional stability of stem cells be maintained after passaging?
Maintain appropriate culture conditions: Ensure that cells remain in suitable environments after passaging, including medium composition, temperature, and CO₂ concentration.
Optimize culture medium: Use validated stem cell culture media and supplements to help maintain pluripotency.
Avoid excessive passaging: Over-passaging can compromise pluripotency and stability, so passage cells according to their growth characteristics.
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Why is karyotype analysis important for HiPSCs?
Chromosomal abnormalities, such as gains, losses, or partial translocations, are common during cell culture. Ensuring that HiPSCs have a normal karyotype is critical for the reliability of cell behavior, observed phenotypes, or drug testing results, rather than effects caused by abnormal karyotypes. Due to the rapid proliferation of HiPSCs, they are particularly prone to such abnormalities. To minimize the risk, experimental passages of HiPSCs should be kept below 40, and karyotype analysis is recommended every 20 passages.
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What is a ROCK inhibitor, and why should it be used with HiPSCs?
ROCK stands for Rho-associated protein kinase. Y-27632 is a small-molecule inhibitor that selectively targets ROCK1. Inhibiting ROCK1 is known to enhance the survival and cloning efficiency of stem cells without affecting their pluripotency.
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What is the doubling time of HiPSCs?
The growth behavior of early-passage HiPSCs is dynamic, which is an inherent characteristic of these cells. Therefore, the doubling time of HiPSC lines has limited reference value, as it changes with passage number. Generally, low-passage HiPSCs require lower seeding densities for expansion, while higher-passage cells may exhibit faster growth. Additionally, culture conditions—including clonal versus monolayer culture, medium composition, and extracellular matrix—can all affect HiPSC growth kinetics.
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What is the origin of HighQC™ GFP Expressing Human Induced Pluripotent Stem Cells, and how are they constructed?
This cell line was derived from fibroblasts that were reprogrammed into iPSCs. The fibroblasts were reprogrammed using retroviral vectors carrying the OCT4, SOX2, KLF4, and MYC gene sequences. After obtaining the iPSCs, the cells were infected with GFP-expressing lentivirus or RFP-expressing lentivirus, resulting in iPSC cell lines labeled with GFP or RFP.
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What is the doubling time and passage limit for HighQC™ Human Embryonic Stem Cells?
Doubling time is approximately 24-36 hours, depending on culture conditions. To maintain their pluripotency, it is recommended to keep the passage number below 20.
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How are HighQC™ Human Hair Follicle Stem Cell isolated?
These cells are isolated using a combination of collagenase and neutral protease digestion.
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What method was used to immortalize Immortalized Human Bone Marrow-Derived Mesenchymal Stem Cells?
These cells are typically immortalized using SV40. Alternatively, hTERT can be used upon request. However, all immortalized stem cells may lose some differentiation potential.
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What is the biosafety level of the cells?
The biosafety level of these cells is BSL-2.
