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C. elegans embryonic cells have a common anterior/posterior (a/p) polarity that is apparent in the localization of the transcription factor POP-1 [1, 2]. The level of nuclear POP-1 remains high in the anterior daughters of dividing cells but is lowered in the posterior daughters [2, 3]. To generate POP-1 asymmetry, most early embryonic cells require contact with signaling cells that express the ligand...
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