sentences:  Sld3 and Sld2 are phosphorylated by CDK, which enables the two replicative proteins to bind to Dpb11.Dpb11 had two pairs of BRCA1 C Terminus (BRCT) domains which are known as a phosphopeptide-binding domains.The N-terminal pair of the BRCT domains binds to phosphorylated Sld3, and the C-terminal pair binds to phosphorylated Sld2.