In this task, you are given a sentence. You are expected to recognize the name of gene or protein. Although there might be several correct answers, you need to write one of them.

 Based on the canonical structure of group II mitochondrial introns ( 21 ) , two editing sites , C2 located at the Intron Binding Site 2 ( IBS2 ) and C3 located in the intron , nine residues downstream from the end of exon 1 in S . tuberosum rps10 are of particular interest .
S . tuberosum