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Loading efficiency of IGF1, HGH, and TGF-β1 microspheres (n = 4)
| Growth factor | % BSA needed | Loading efficiency |
| IGF1 | 0% | 88.95 ± 9.66% |
| HGH | 1% | 69.42 ± 12.48% |
| TGF-β1 | 3% | 40.68 ± 4.04% |
Growth factors required different concentrations of carrier protein to achieve loading depending on their physical properties.
