Figure 1.
(a) Vitreous ice–embedded microtubules observed in interphasic extracts supplemented with isolated centrosomes and incubated for 20 s at 25°C. E, extensions observed at microtubule ends; and C, centriole. (b and c) Vitreous ice–embedded microtubules observed in interphasic extracts in the presence of 7.5 μM recombinant Op18/stathmin. Addition of Op18/stathmin in this condition induces the disappearance of sheets at microtubule ends (black arrows). F, frayed end; and B, blunt end. Bar, 200 nm.