Alignment of grass chloroplast genomes. The sequence of rice chloroplast genome is compared to those of Brachypodium (top alignment), maize (middle), and wheat (bottom). Sequences were aligned in mVISTA  and the annotation shown above the alignment corresponds to the rice genome. Grey arrows above the alignment indicate genes and their orientation. Colors indicate location of exons, conserved non-coding sequences (CNS), and untranslated regions (UTRs). Ribosomal genes are colored as CNS. Thick black lines show the position of the IRs. Other grass genomes mentioned in the text have been omitted for the sake of simplicity.