>4y4yS (S:) observed residues (from ATOM records)
gitvlthselsaeigvtdsivvsselvmpytvgtwlrgvaanwskyswlsvrytyipscp
sstagsihmgfqydmadtvpvsvnqlsnlrgyvsgqvwsgsaglcfingtrcsdtstais
ttldvsklgkkwypyktsadyatavgvdvniatplvparlvialldgssstavaagriyc
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