The supplementary figures were within the same PDF so we are not sure why the author had trouble gaining accessing to the figures. Assuming the reviewer had trouble understanding the contents of the supplement, we have tried to simplify somewhat the text in the supplementary figure legends.
The abstract now reads as follows: GRIN2B mutations are rare but often associated with patients having severe neurodevelopmental disorders, including a varying range of symptoms such as intellectual disability, developmental delay and epilepsy.