A, NvNotch is similar in organization and residue identity to those found in Bilaterian animals. B, Several DSL domain-containing sequences were isolated from N. vectensis. The Nematostella Delta contains one DSL domain, EGF repeats and a predicted transmembrane domain. Two additional DSL domain-containing sequences are unusual in the presence of multiple DSL domains. One of these sequences was found to contain a transmembrane domain. C, Four Hes genes (NvHes1-4) and three Hes-like (NvHl1-3) genes are present in N. vectensis. Conserved domains of the NvHes and NvHl genes are the bHLH domain (b and HLH), the orange domain (OR) and the C-terminal WRPW peptide. NvHes1 lacks a WRPW domain but maintains an orange and HLH domain. Positions of domains are indicated by numbers which refer to residues of the predicted protein.