Gene map of Chlorokybus cpDNA. Genes (closed boxes) shown on the outside of the map are transcribed in a clockwise direction, whereas those on the inside of the map are transcribed counterclockwise. All ORFs larger than 75 codons as well as genes absent from Mesostigma cpDNA are represented in beige. Blocks of gene sequences colinear with Mesostigma cpDNA are shown as alternating series of green and red boxes. Genes present in Mesostigma cpDNA but located outside these conserved blocks are shown in grey. tRNA genes are indicated by the one-letter amino acid code (Me, elongator methionine; Mf, initiator methionine) followed by the anticodon in parentheses. The intron in trnL(uaa) is represented by an open box.