FGF receptor inhibitor SU5402 did not increase cell mixing in SC‐WT or SC‐S1S2‐astrocyte cultures, but showed a trend towards reduced cell mixing (i.e., boundary formation) although this was not statistically significant (Fig. 3 A,B).
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In the absence of HRG, boundaries were formed in SC‐WT‐astrocyte cultures, while SC‐S1S2‐astrocyte cultures showed slightly more mixing although this did not reach statistical significance (Fig. 3 D,E).