Table I.

EM of ring formation on microtubules at different Dam1 complex concentrations

Dam1 complex concentration	No. of microtubules	Total microtubule length	No. of rings	Ring density
nM		µm		µm−1a
0.5	27	259	0	0
1	16	280	20	0.1 ± 0.02
2	26	308	76	0.2 ± 0.03
5	26	256	450	2 ± 0.08
10	18	33	535	17 ± 0.7
50	13	16	1,312b	82 ± 3
100	11	11	1,282b	120 ± 3
200	9	11.5	1,358b	120 ± 3

^aErrors represent counting uncertainties.

^bRings stacked together in pairs to form doublets and/or coils.