To this end, we generated ME‐primed μNETs using normal H1 human embryonic stem cell, an isogenic FMR1 knock‐out H1 cell line (FMR1‐KO H1) and a FXS human embryonic stem cell line (FXS‐hESC).[44]The FMR1‐KO‐H1 and FXS‐hESC lines were verified for complete absence of FMRP expression using immunoblotting. Here, FMR1 is linked to fragile X syndrome.