May be involved in ciliogenesis (PubMed:28005958). Probably plays an important role in centrosome cohesion during interphase. Monomer and homodimer (Probable). Forms a complex in vitro with both NEK2 kinase and the PPP1CC catalytic subunit of protein phosphatase 1 (PP1) (PubMed:9647649, PubMed:10880350). Interacts with CEP135 (PubMed:18851962). Interacts with CROCC/rootletin (By similarity). Interacts with CNTLN (PubMed:24554434). Interacts with NIN (via C-terminus) (By similarity). Component of the core centrosome. In interphase cells, it specifically associates with the proximal ends of both mother and daughter centrioles. Associates with the centrosome in interphase cells. In mitotic cells, it dissociates from the mitotic spindle poles. At the end of cell division, it reaccumulates at centrosomes. Ubiquitously and weakly expressed. Differentially phosphorylated during cell cycle. Phosphorylation may regulate association/dissociation from centrosome. During M phase of mitosis, C-terminal part is phosphorylated by NEK2, suggesting that it may trigger the dissociation from the mitotic centrosome. Dephosphorylated in vitro by the PP1 phosphatase. The disease is caused by variants affecting the gene represented in this entry. Antibodies against CEP2 are present in sera from patients with autoimmune diseases that developed autoantibodies against centrosomal proteins.