Meningeal cells and glia establish a permissive environment for axon regeneration after spinal cord injury in newts

Table 1 The number of animals observed at each stage and time point

Time point	Total	Retraction	Growth initiation	Wrapping	Wrapping/ wisping	Wisping	Wisping/ spiking (no ET)	Spiking (no ET)	Spiking (with ET)	Contact	Growth beyond injury (not recovered)	Growth beyond injury (recovered)
1 day	6 (3/3)	6 (3/3)
3 day	8 (4/4)	6 (4/2)	2 (-/2)
1 week	15 (11/4)	3 (3/-)	12 (8/4)
2 week	11 (6/5)		2 (1/1)	3 (1/2)	2 (1/1)	4 (3/1)
3 week	10 (5/5)			2 (2/-)		4 (-/4)			1 (1/-)	1 (1/-)	2 (1/1)
4 week	8 (4/4)			4 (3/1)					1 (1/-)		3 (-/3)
6 week	7 (4/3)					1 (-/1)	1 (-/1)	1 (-/1)	2 (2/-)	1 (1/-)		1 (1/-)
9 week	6 (4/2)										2 (1/1)	4 (3/1)
Totals	71 (41/30)	15 (10/5)	16 (9/7)	9 (6/3)	2 (1/1)	9 (3/6)	1 (-/1)	1 (-/1)	4 (4/-)	2 (2/-)	7 (2/5)	5 (4/1)

The numbers in parentheses break the totals for each category into rostral and caudal tracer application, respectively. For example, (4/2) indicates 4 animals received rostral tracer and 2 received caudal tracer. Animals that had recovered function were chosen preferentially for rostral tracer application. ET, ependymal tube.

ISSN: 1749-8104