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Cover: In the C. elegans embryo, centrosome duplication is required for bipolar spindle formation and normal cell division. In the article by Medley et al. page 17, the authors report that Casein Kinase II (CK2) acts as a negative regulator of centrosome duplication through a genetic interaction with zyg-1. The image illustrates that the zyg-1(it25) mutant C. elegans embryo exhibits monopolar spindles at the second mitosis, which results from a failure of centrosome duplication during the first cell cycle. The embryo is stained for centrioles (SAS-4: green), microtubules (red), and DNA (blue). Image created by Mi Hye Song and licensed under a Creative Commons Attribution 4.0 International licence.