FIGURE 2.

Sequence comparison of the receptor discriminator regions in three arrestin subtypes. The residues that differ between bovine arrestin-1 and arrestin-2 are shown in bold, and the residues that are exposed (according to the crystal structure of both proteins) are underlined. Residues unique for arrestin3 are italicized. Ten residues replaced with alanines in Figs. 5 and 6 are shadowed. The positions of the first and last residues are shown in parentheses before and after the sequence.