Table 1. Overview of samples.

ID	Age (pcw)	Sex	FB	MB
Y = released. N = not released (excluded after MDS clustering analysis). FB = forebrain. MB = midbrain. Age is given in post conception weeks (pcw).
S13128	5	Male	Y	Y
S13048	5.5	Female	Y	Y
S13052	5.5	Male	Y	Y
S13097	5.5	Male	Y	N
S13192	5.5	Male	N	Y
S13290	5.5	Male	Y	Y