The permuted mitochondrial 5S rRNAs in brown algae represent the most unconventional case, where the closing helix I, which otherwise brings together the molecule's 5′ and 3′ ends, is replaced by a (closed) hairpin resulting in an open three-way junction.
The rearranged mitochondrial 5S rRNAs in brown algae present an unusual instance, where the closing helix I, which typically reunites the molecule's 5′ and 3′ ends, is replaced by a (closed) loop resulting in an open three-way junction.