FIGURE 1.

Domain structure of Xenopus CCR4 and CAF1 homologs. A, domain structure for two of four Xenopus CCR4 homologs (CCR4a and CCR4b). Depicted are the leucine-rich repeat (LRR) motif and the CCR4 deadenylase domain; the catalytic residues are indicated. The percentages of identity and similarity are indicated below. B, domain structure for the two Xenopus CAF1 homologs. Depicted is the CAF1 domain; the catalytic residues are indicated. The percentages of identity and similarity are indicated below.