A recombinant S100A4 protein was produced in Pichia pastoris (Pichia). The expression vector contained parts of the AOX1 promoter and also a secretion signal, making it possible to purify the protein from the yeast media after methanol induction. Attempts were made to purify the protein from the media both by hydrophobic interaction chromatography (HIC) and by anionic ion exchange chromatography (IEC). The binding capacity to the hydrophobic material was rather low, but the eluted protein did however show an acceptable purity for utilization in downstream functional assays. The protein eluted...