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Fig. 7. Nuclear events and the formation of mitotic asters in a Pattern 3
conjugate. The time (in minutes) after activation is given in the upper
right corner of each image. White arrows indicate `aster-like structures';
white arrowheads indicate nuclei; black arrowheads indicate single asters.
(A) A pronucleus (PN) forms. (B) The first mitotic cycle. An
`aster-like structure' developed at a site where the PN had been located. Two
asters emerge, away from the pronuclear site. (C) One nucleus reforms.
(D) The second mitotic cycle. Four asters and a single `aster-like
structure' develop. (E) One nucleus reforms. (F) The third
mitotic cycle forms eight asters and an `aster-like structure'. (G) One
nucleus reforms. (H) The fourth mitotic cycle, forms 16 asters and an
`aster-like structure'. (I) One nucleus reforms. (a,c,e,g,i)
Differential interference-contrast microscopy; (b,d,f,h) polarization
microscopy.
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