Protein by family
Qkine is committed to manufacturing enhanced-quality bioactive proteins to improve scientific outcomes and reproducibility. We provide a complete portfolio of animal origin-free (AOF) and carrier protein-free growth factors and cytokines for stem cell and organoid culture. Our products support applications including iPSC and ESC maintenance and differentiation, 3D cell culture, organoids, neural stem cell culture and emerging sectors such as organ-on-chip and cultivated meat, fish, fat and dairy.
Activin proteins
Qkine is committed to manufacturing bioactive proteins of the highest quality to enhance scientific outcomes and improve reproducibility. Our stringent quality control procedures in place ensure your results are reliable and reproducible every time. We couple this with unrivaled lot-to-lot consistency, ensuring every single batch meets the same quality standards as all previous ones, thereby reducing the need for batch testing.
Proteins for Activin proteinsBone morphogenetic proteins and antagonists
Bone morphogenic proteins (BMPs) are members TGFβ family and are important regulators of tissue development and growth. Qkine BMP range includes BMP-2 and BMP-4 which are key regulators of embryogenesis and potent differentiation factors for embryonic stem cells (ESC) and induced pluripotent stem cells (iPSC). BMP antagonists are important regulators of BMP activity in development. Qkine BMP antagonist range includes mouse and human noggin and gremlin 1.
Proteins for Bone morphogenetic proteins and antagonistsColony stimulating factors
Colony-stimulating factors family, also known as hematopoietic growth factors, include granulocyte-macrophage-CSF (GM-CSF), macrophage colony formation CSF (M-CSF), granulocyte-CSF (G-CSF), and multi-CSF, which is also referred to as interleukin-3 (IL-3). These CSFs serve various functions such as promoting cell proliferation, facilitating cell maturation, and encouraging cell differentiation.
Proteins for Colony stimulating factorsCytokines
Proteins for CytokinesEpidermal growth factors
The Epidermal growth factor (EGF) family includes EGF and Neuregulins. EGF plays crucial roles in the regulation of cell proliferation, survival, differentiation, and migration. Epidermal growth factor (EGF) stimulates cell growth and differentiation by binding to its receptor, EGFR.
Proteins for Epidermal growth factorsExtracellular matrix proteins
The extracellular matrix (ECM) consists of hundreds of different molecules and is the non-cellular component of tissues. Some of the major protein components of the ECM are collagen, fibronectin, elastin, laminin, proteoglycan, fibulins, vitronectin.
Proteins for Extracellular matrix proteinsFibroblast growth factors
Fibroblast growth factors (FGFs) are a family of 22 proteins (18 secreted proteins and 4 intracellular FGFs) involved in many developmental processes. Fibroblast Growth Factors stimulate growth or differentiation of cells of mesodermal or neuroectodermal origin. Qkine FGF portfolio includes many members of the FGF superfamily: FGF-1, FGF-2, FGF-4, FGF-7, FGF-8a, FGF-8b, FGF-9, FGF-10 and FGF-18.
Proteins for Fibroblast growth factorsHepatocyte growth factors
Hepatocyte growth factor (HGF), also known as Scatter factor, acts as a multifunctional cytokine on cells including endothelial and epithelial cells, melanocytes, and keratinocytes. HGF is now recognized as a key player in mediating protection against various inflammatory and autoimmune diseases.
Proteins for Hepatocyte growth factorsIGF family
The insulin-like growth factors (IGFs) are proteins with a similar structure to insulin. This family includes ligands and insulin, receptors and insulin receptor, and IGF-binding proteins. The insulin-like growth factor family plays important roles in differentiation, cellular metabolism, proliferation, apoptosis and transformation.
Proteins for IGF familyInterleukins
IL superfamily is a large group of cytokines, including proteins known as interleukins and interleukin receptors. Members of this superfamily play pivotal roles in diverse biological processes such as immunity, inflammation, and hematopoiesis. Subgroups within the interleukin superfamily include the IL-1, IL-6, IL-10, IL-12, and IL-17 subfamilies, along with additional interleukins and receptors.
Proteins for InterleukinsNeurotrophin family
The Neurotrophin family includes Nerve Growth Factor (NGF), Brain-Derived Neurotrophic Factor (BDNF), Neurotrophin-3, and Neurotrophin-4. Functioning as growth factors, Neurotrophins play crucial roles in regulating the development, survival, and maintenance of neurons within both the central and peripheral nervous systems, thereby contributing significantly to neural plasticity and overall nervous system function.
Proteins for Neurotrophin familyOther growth factors
Growth factors are essential for stimulating cell growth, proliferation, differentiation, and migration. They act as signaling molecules, mediating cell-cell communication to regulate various cellular processes, including wound healing, tissue repair and development.
Proteins for Other growth factorsPDGF family
The PDGF family is composed of PDGF-A, PDGF-B, PDGF-C, and PDGF-D. These four PDGFs remain inactive in their monomeric forms. Upon activation, PDGFs interact with protein tyrosine kinase receptors known as PDGF receptor-α and -β.
PDGFs play essential roles in controlling cell survival, proliferation, and migration both during development and the process of wound healing.
R-spondin family
R-spondin family (RSPO) includes 4 secreted glycoproteins (R-spondin 1, R-spondin 2, R-spondin 3, R-spondin 4). Implicated in the activation and regulation of the Wnt signaling pathway, RSPO proteins contribute significantly to various biological processes throughout embryonic development, adult tissue maintenance, and the onset of disease. This family of secreted proteins is also used widely in organoid culture.
Proteins for R-spondin familyTGF-β superfamily
Members of the TGF-beta superfamily, such as activins, TGF-beta 1, TGF-beta 2, TGF-beta 3, GDF-5, GDF-15, GDNF, and BMPs, play crucial roles in governing various developmental and physiological processes. These proteins contribute to the regulation of fundamental cellular properties and vital cellular processes, such as cell growth, differentiation, proliferation, survival, apoptosis, morphogenesis, and tissue remodeling.
Proteins for TGF-β superfamilyPurchase in bulk and save
If you need large quantities, contact us for a bulk quote. We can scale up the production of any protein to meet your needs and offer additional discounts on bulk orders.

Bioactivity of recombinant BMP-4 protein was determined by a luciferase assay. Qkine E. coli expressed BMP-4 (Qk038, green) has a higher bioactivity (EC50 = 19.4 pM) than alternative BMP-4 expressing in mammalian cells (Supplier A, blue, EC50=133.5 pM) or E. coli (Supplier B, black, EC50 = 43.9 pM).
All our proteins are equally or more bioactive than those from other dominant suppliers
At Qkine, we test and validate the biological activity of all our growth factors against other suppliers’ proteins to ensure that we provide you with the highest level of biological activity.
Bioactivity comparison between leading suppliers shows Qk038 animal origin-free BMP-4 (expressed in E. coli) has a higher bioactivity than microbial and mammalian expressed BMP-4 from alternative suppliers.
All our proteins adhere to the Nine-point Qkine Quality Commitment
1. Certified animal-free with full traceability
2. Manufactured within our ISO 9001:2015-certified facility with stringent in-process control measures
3. Rigorously tested for accurate protein recovery from vials
4. Subject to quantitative bioactivity analysis with integrated lot-to-lot reproducibility criteria
5. Proven to have industry-leading protein purity levels
6. Subject to comprehensive identity analysis for structurally complex bioactive proteins
7. Assayed to ensure industry-leading low endotoxin levels
8. Rigorously tested for sterility and mycoplasma contamination for confident use in cell-culture applications
9. From concept to manufacture, our proteins are designed to be the best
Raising the standard in bioactive protein manufacturing and innovation
Our science team is here to help, please contact us if you have any questions.