We have described cell polarisation in the zygotes the oogamous brown alga Dictyota. Unlike the zygotes of Fucus, the fertilised egg cell quickly elongates along a predetermined axis in the egg. The resulting cell has 2 poles, of which one will develop into the basal cell fate, the rhizoid.
Cell polarisation, whereby determination of the direction and the sense of the polarisation vector are temporally and mechanistically uncoupled, is unique and represents a favourable system to gain insights into the processes underlying cell polarity establishment in general.
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