A chlamydial or proteobacterial origin for plastid hexose-phosphate transporters. Maximum likelihood (PhyML) phylogeny of UhpC-type hexose-phosphate transporters in algae, plants, and bacteria (for details, see Price et al., 2012). Bootstrap values (when ≥50%) are shown at the branches. Red algae, Viridiplantae, glaucophytes, and Chlamydiae are shown in red, green, magenta, and blue text, respectively.