This family consists of a novel motif designated as SERTA (for SEI-1, RBT1, and TARA), corresponding to the largest conserved region among TRIP-Br proteins. The function of this motif is uncertain, but the CDK4-interacting segment of p34SEI-1 (amino acid residues 44-161) includes most of the SERTA motif.
Jiyao W et al.(2023). "The conserved domain database in 2023.",