You’ve decided to add recombinant human Erythropoietin (rhEPO) to your reagent shelf. Maybe you’re starting an erythroid differentiation project, validating a new HIF-pathway inhibitor, or running TF-1 cell bioassays. Either way, not all “recombinant EPO” sold today is created equal — and the wrong choice can cost you weeks of failed experiments.

Here’s what to look for, and how Biofargo’s Recombinant Human EPO Protein (TL-636-0050) measures up.

1. Expression System: Mammalian vs. Bacterial

EPO is a heavily glycosylated cytokine — 3 N-linked + 1 O-linked glycosylation sites — and that glycosylation is essential for full bioactivity in vivo and in many primary cell models. E. coli-expressed EPO lacks these glycans entirely.

If you need physiologically relevant bioactivity, choose mammalian-expressed EPO.

✅ Biofargo TL-636-0050 is expressed in HEK293 cells, preserving native human glycosylation.

2. Confirm Bioactivity — Don’t Just Trust SDS-PAGE

A clean band on SDS-PAGE means your EPO is the right size and reasonably pure — but it tells you nothing about whether the protein is biologically active.

EPO bioactivity depends on glycosylation, proper folding, and correct binding to EPOR. Only a cell-based assay can confirm function.

✅ Biofargo standard: every lot is validated by dose-dependent stimulation of TF-1 cell proliferation, with ED50 ≤0.5 ng/mL.

3. Purity

Purity is the floor, not the ceiling — but it still matters. Contaminating proteins can confound proteomics, mass spec, and sensitive cell-based assays.

✅ Biofargo TL-636-0050: >90% by SDS-PAGE.

4. Sequence Verified Against the Reference

Make sure your supplier discloses the exact sequence used. Biofargo’s TL-636-0050 is based on the canonical reference sequence NP_000790.2, with a C-terminal His-tag for downstream affinity applications and easy detection.

5. Customer Support That Actually Knows the Protein

When something goes wrong with a reagent, you want a real scientist on the other end of the email — not a generic ticket queue.

✅ Biofargo’s team includes life-science specialists who can troubleshoot your application, recommend working concentrations, and discuss your specific assay setup.