Table III. Hook curvature for beam microtubules viewed looking away from the bundle's centrosomal end 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	Total	MT with ambiguous hook decorationb	Percentdecorated MTc
Bundle
A	139	33	10	0	182	0	50	65
B	87	28	12	0	127	3	24	56
C	92	20	7	0	119	3	63	45
D	62	24	3	0	89	4	39	41
E	30	18	5	1	54	0	15	53
Totals	410	123	37	1	571	10	191	Mean = 52

All microtubules with clockwise hooks possessed one hook each. 98% 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.