Comparisons of isolated and in vivo mitotic apparatuses.
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MITOTIC apparatuses (MA) isolated from sea urchin eggs are not functional 1 , and although their biochemical composition 1-5 , stability 6 and morphological characteristics 7-10 have been studied, isolated MA may be quite different from in vivo MA. In particular, MA may lose material during isolation 11 , and the birefringence may be altered. We therefore studied the effect of the isolation procedure on mass and birefringence. © 1969 Nature Publishing Group.
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