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Home/recombinant growth factor & cytokine, FGF family, human, iPSC / ESC maintenance, organoid/recombinant human FGF-2 (bFGF) 145 aa protein (Qk025)


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recombinant human FGF-2 (bFGF) 145 aa protein (Qk025)

Human FGF2 /bFGF protein (145 aa) is our gold-standard and recommended FGF2 / bFGF protein for induced pluripotent stem cell (iPSC) and embryonic stem cells (ESC) maintenance, and induced pluripotent and mesenchymal stem cells proliferation and differentiation.

High purity and bioactivity 17 kDa FGF2 / bFGF protein, animal-derived component free (ACDF) and carrier-protein free (CF) comprising the core structured region (145 amino acids) sufficient for full biological activity.

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


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enquiries, bulk and stock reservation, please email

1mg may be despatched as 2 x 500µg


  • high purity human FGF2 / basic FGF, 145aa form comprising residues 144-288 (Uniprot: P09038)

  • 17 kDa

  • expressed in E. coli

  • animal-free (AOF) and carrier protein-free.

  • manufactured in our Cambridge, UK laboratories

  • frozen in PBS at 1 mg/ml

  • prepare single use aliquots, add carrier protein if desired, store frozen at -20 oC or -80 oC

handling and storage FAQ

featured applications

  • expansion of induced pluripotent, embryonic and mesenchymal stem cells

  • cell expansion


Human FGF2 / bFGF Qk025 protein bioactivity lot #014

FGF2 activity is determined using the Promega serum response element luciferase reporter assay (*) in transfected HEK293T cells.

Cells are treated in triplicate with a serial dilution of FGF2 for 6 hours. Firefly luciferase activity is measured and normalized to the control Renilla luciferase activity. EC50 = 103 pg/ml (6.3 pM).  Data are from Qk025 batch #014

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


Human FGF2 / bFGF Qk025 protein purity SDS-PAGE lot #014

FGF2 migrates as major band at 17 kDa in non-reducing (-βME) conditions and upon reduction (+βME). The higher molecular mass band at 35 kDa is a dimer that we always see in our highly purified human FGF2, the presence of this does not affect biological activity.

Purified recombinant protein (7 µg) was resolved using 15% w/v SDS-PAGE in reduced (+β-mercaptothanol, R) and non-reduced conditions (NR) and stained with Coomassie Brilliant Blue R250.  Data from Qk025 lot #014

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%

request CoA/animal-free certificate
download MSDS

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 (FGF2) – also known as basic fibroblast growth factor (bFGF) – has a broad range of physiological roles including regulation of cell proliferation and differentiation. FGF2 is used to support the maintenance of human embryonic stem cells1-3 and proliferation and differentiation of induced pluripotent and mesenchymal stem cells.

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

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What others are saying

  1. Keele University, UK

    Just to let you know, I've tested the GFs and the Activin A and human FGF worked exceptionally well compared to what I usually use

    Keele University, UK

    “Just to let you know, I’ve tested the GFs and the Activin A and human FGF worked exceptionally well compared to what I usually use”. Keele, UK.

    A 14-day directed differentiation protocol was applied to human embryonic stem cells in order to generate chondroprogenitors. The use of Qkine human Activin-A and human FGF resulted in significantly higher levels of ACAN, COL2 and SOX9 gene expression and significantly lower levels of OCT4 gene expression.

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