Table 3.

Microtubule invasion of collaterals varies as a function of collateral length and is affected by raising neurons overnight in 7 nm taxol or 83 nm nocodazole

	% of collaterals containing microtubules (length in μm)
	<10	11–20	20–30	>30
β-tubulin staining
No treatment	15 (236)	54 (111)	76 (26)	93 (69)
DMSO	14 (886)	54 (183)	79 (56)	99 (96)
Taxol (7 nm)	6 (1247)^3-a	40 (145)^3-c	72 (29)	93 (42)
Nocodazole (83 nm)	4 (1186)^3-a	36 (285)^3-b	76 (71)	94 (84)
DαT staining
No treatment	6 (274)	30 (63)	68 (28)	88 (69)

Fisher’s exact test was used to compare the frequency of microtubule invasion of collaterals in drug-treated cultures with DMSO controls. Numbers in parentheses reflect the number of collaterals in the given length class scored.
↵F3-a p < 0.0001.
↵F3-b p < 0.001.
↵F3-c p < 0.05.