Key result
Form birefringence of isolated sea-star oocyte spindles is primarily due to microtubules, with data best fitting a theoretical curve for rodlet index 1.512 and volume fraction 0.0206.
The study demonstrates that the form birefringence of mitotic spindles is primarily of microtubular origin and fits the Wiener equation.
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Isolated spindles retain birefringence and consist primarily of microtubules; leaves open the contribution of minor non-microtubule components to meiotic spindle function.
Sato et al. (1975) studied this question. Form birefringence of isolated sea-star oocyte spindles is primarily due to microtubules, with data best fitting a theoretical curve for rodlet index 1.512 and volume fraction 0.0206.
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