a strong trendp = 0.12
RPMI already showed expression of all three proteins, which were necessary for podocyte functionality, the addition of retinoic acid significantly increased the protein expression levels of nephrin ( p = 0.04), with fold changes ranging from 1.4 to 14.95, and a strong trend towards significance for synaptopodin ( p = 0.12) with fold changes ranging from 1.5 to 7.8 was observed ( Figure 2 a,b and Supplementary Figure S1j ).