Fig. 3. Alignment of Protein 4.1B and DAL-1. Protein 4.1B contains unique sequences not present in DAL-1. DAL-1 is represented by residues M¹¹⁰ and S⁵⁴², with deletions in the N- and C-termini and internal deletions within the U2 and SAB domains. Brackets denote internal sequences absent in DAL-1.