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PAR proteins play roles in the establishment and maintenance of polarity in many different cell types in metazoans. In C. elegans, polarity established in the one-cell embryo determines the anteroposterior axis of the developing animal and is essential to set the identities of the early blastomeres. PAR-1 and PAR-2 colocalize at the posterior cortex of the embryo. PAR-3, PAR-6 and PKC-3 (aPKC) colocalize at the anterior cortex of the embryo. A process of mutual exclusion maintains the anteriordoi:10.1242/dev.02544 pmid:16943281 fatcat:icddnulg4fa7vo2wlsgtzli7vq