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The structures of hexactinellid mtDNA encoded trnS(ucu). (A) The structure of trnS(ucu) from A. vastus (redrawn from the tRNAscan-SE prediction) is peculiar, but unique among the hexactinellids. (B) The trnS(ucu) genes of I. panicea and S. nux (redrawn from Haen et al., 2007) share an unusual structure similar to that found in some bilaterians.
