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Recombinant bovine/porcine FGF-2 (bFGF) 154 aa protein (Qk056)

Recombinant bovine/porcine FGF2 protein 154 aa (bFGF/basic FGF), this is the long form of FGF-2 used for the development of optimized serum-free culture media for species-specific bovine (cow) and porcine (pig) cultivated meat and veterinary research applications. Used in comparative media optimization studies with Qk040 porcine/bovine FGF-2 145 aa.

FGF-2 is used extensively in the maintenance and proliferation of induced pluripotent (iPSC) and embryonic stem cells (ESC)1-3  and for enhancement of proliferation in primary cell culture.

High purity 16 kDa FGF-2 / bFGF 154 aa protein, animal origin free (AOF) and carrier-protein free (CF).

Orders are typically shipped same or next day (except Friday).
Easy world-wide ordering, direct or through our distributors.

1000µg will be despatched as 2 x 500µg

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Bulk and stock reservation available


  • High purity recombinant bovine/porcine FGF2 protein (154 aa) / bFGF (Uniprot: P03969)

  • >98%, by SDS-PAGE quantitative densitometry

  • 17.1 kDa

  • Expressed in E. coli

  • Animal origin-free (AOF) and carrier protein-free.

  • Manufactured in our Cambridge, UK facility

  • Lyophilized from Tris/NaCl/CyS/mannitol

  • Resuspend in water at >100 µg/ml, prepare single use aliquots, add carrier protein if desired, store frozen at -20 oC (short-term) or -80 oC (long-term)

This protein has recently been reformulated and will now arrive lyophilized. This change has been made to provide enhanced stability to ensure that we offer the best customer experience in terms of shipping and storage and to align with our company sustainability goals. Please visit our reconstitution page or contact for further information or to request the previous datasheet.


Bovine /Porcine FGF-2 basic FGF Qk056 protein bioactivity

FGF-2 activity is determined using the Promega serum response element luciferase reporter assay (*) in transfected HEK293T cells. EC50 = 85 pg/ml (5 pM).

Cells are treated in triplicate with a serial dilution of FGF-2 for 3 hours. Firefly luciferase activity is measured and normalized to the control Renilla luciferase activity. Data from Qk056 lot #104386.

*Promega pGL4.33[luc2P/SRE/Hygro] #E1340


Porcine /Bovine FGF-2 basic FGF Qk056 protein purity SDS-PAGE

Recombinant bovine/porcine FGF2 protein (154 aa) migrates as a single major band at 16 kDa in non-reducing (NR) conditions and some dimeric protein migrating at 32 kDa. Upon reduction (R), only the 16 kDa band is visible.  No contaminating protein bands are visible.

Purified recombinant protein (3 µg) was resolved using 15% w/v SDS-PAGE in reduced (+β-mercaptothanol, R) and non-reduced (NR) conditions and stained with Coomassie Brilliant Blue R250.  Data from Qk056 batch #104386.

Further quality assays

  • Mass spectrometry: single species with expected mass

  • Endotoxin: <0.005 EU/μg protein (below level of detection)

  • Recovery from stock vial:  >95%

We are a company founded and run by scientists to provide a service and support innovation in stem cell biology and regenerative medicine.  All our products are exceptionally high purity, with complete characterisation and bioactivity analysis on every lot.

Protein background

Fibroblast growth factor 2 (FGF-2) – also known as basic fibroblast growth factor (bFGF) – has a broad range of physiological roles including regulation of cell proliferation and differentiation. FGF-2 is used to support the maintenance of porcine (pig) and bovine (cow) embryonic stem cells and proliferation, and differentiation of induced pluripotent and mesenchymal stem cells.  FGF-2 is an essential growth factor in cultivated meat stem cell, or primary cell proliferation culture media.  The two forms of recombinant bovine/porcine FGF2 protein 154 aa (Qk056) and 145 aa (Qk040)  available from Qkine facilitate the development of fully optimized serum-free culture media for cellular agriculture applications.

Our products are for research use only and not for diagnostic or therapeutic use.  Products are not for resale.

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