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Cell size control requires mechanisms that integrate cell growth and division. Key to this integration in fission yeast is the SAD family kinase Cdr2, which organizes a set of cortical nodes in the cell middle to promote mitotic entry through Wee1 and Cdk1 [1–3]. Cdr2 is inhibited by a spatial gradient of the DYRK kinase Pom1 emanating from cell tips in a cell-size-dependent manner [2, 3], but how...