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Size‐exclusion chromatography with native and heat‐treated 4‐hydroxytryptamine/psilocin kinase PsiK. Both heat‐inactivated and active PsiK eluted at 15.9 mL (corresponding to ca. 43 kDa). The calculated mass of monomeric N‐terminally His‐tagged PsiK is 44.0 kDa. Calibration trace: a) 669 kDa (thyroglobulin), b) 440 kDa (ferritin), c) 158 kDa (aldolase), d) 75 kDa (conalbumin), e) 43 kDa (ovalbumin).
