Table 1.

Description of brain tissues used.

Age	Age group	Source
Carnegie Stage 17	6 pcw	HDBR
Carnegie Stage 17	6 pcw	HDBR
Carnegie Stage 17	6 pcw	HDBR
10 pcw	10–17 pcw	HDBR
10 pcw	10–17 pcw	HDBR
14 pcw	10–17 pcw	HDBR
14 pcw	10–17 pcw	HDBR
17 pcw	10–17 pcw	HDBR
17 pcw	10–17 pcw	HDBR
19 pcw	19–20 pcw	HDBR
19 pcw	19–20 pcw	HDBR
20 pcw	19–20 pcw	HDBR
15 years old	Young	NBTR
20 years old	Young	NBTR
20 years old	Young	NBTR
68 years old	Old	NBTR
73 years old	Old	NBTR
78 years old	Old	NBTR

HDBR = Human Developmental Biology Resource; NBTR = Newcastle Brain Tissue Resource; PCW = post-conception weeks; Gestational weeks (GW) are 2 weeks less that than pcw.