Table II. Hook curvature for apico-basally viewed pillar microtubules in the outer pillar cells of a 21-d-old mouse.

	MT with counterclockwise hooks/hooks per MTa					MT with clockwise hooks/hooks per MTa
	1	2	3	4	Total	1	2	Total	MT with ambiguous hook decorationb	Percentdecorated MTc
Bundle
A	105	20	13	1	139	6	0	6	114	27
B	35	6	2	0	43	4	0	4	42	12
C	27	11	2	0	40	0	1	1	8	29
D	26	0	2	0	28	2	0	2	25	29
E	12	0	0	0	12	1	0	1	3	6
Totals	205	37	19	1	262	13	1	14	192	Mean = 21

95% of the unambiguously decorated microtubules bore counterclockwise hooks.

^aDetails of the number of counterclockwise, or clockwise, hooks per microtubule are shown for each bundle. Most microtubule profiles possessed one hook each.

^bDetails of the ambiguous patterns of decoration are given in the text.

^cThe percentage of cross-sectional microtubule profiles in each bundle that had been decorated.