analysis of GIF:GM-CSF (a) and GIF:IL-2 (b) complexes purified after co-expression of GIF and GM-CSF/IL-2 in HEK293T cells. GIF:GM-CSF (c) and GIF:IL-2 (d) complexes re-purified after addition of a 10-fold excess of purified IL-2 or GM-CSF respectively. For each, a graph is shown plotting the differential refractive index and the derived molecular weight (grey) as a function of the elution volume after SEC. The resulting mean MW and corresponding standard deviation are presented at the top of each chromatogram.