Additional file 4.
Multiple sequence alignment of human and zebrafish arrestins. A PDF file showing a multiple sequence alignment of the human arrestin family and select fish arrestins. It shows protein conservation and divergence of different vertebrate arrestins. Alignment region of beta arrestin helix I suggests this structural element is absent in alpha arrestins. The conservation of PY motifs in alpha arrestins suggests they are functional.
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Alvarez BMC Evolutionary Biology 2008 8:222 doi:10.1186/1471-2148-8-222