A method of purifying a Growth Factor Protein in a purification sequence employing chromatography is provided. The method comprises performing at least one chromatography step using a multimodal resin, binding the Growth Factor Protein to the multimodal resin at a pH from 4 to 6.2, and eluting the Growth Factor Protein at a pH in the range of from 5.5 to 6.5. The elution of Growth Factor Protein is improved by addition of arginine and/or NaCl in the eluting buffer. Optionally the multimodal resin step is followed by a yeast derived affinity ligand resin step, which results in a purity of the product greater than 90%.