Table 1.

Number of animals used for dextran experiments

	Cortex (n)	Brainstem (n)	CSF (n)	Total animal number
E16–30 s	3	–	2	5
E16–5 min	4	4	3	7
E19–30 s	3	–	4	7
E19–1 min	–	–	4	4
E19–5 min	6	6	4	10
P4–5 min	4	4	4	4
Adult–5 min	4	4	4	4

Number of animals used for each experimental group. For fetal experiments, brain regions and CSF were collected from separate individuals due to small size, in all postnatal rats brain and CSF samples were collected from the same animal; (n) indicates numbers of samples