The plastid genomes of plants are prime targets for crop engineering because of their high levels of protein expression and low risk of transgene escape. But a major problem in extending transplastomics to cereal crops has been the difficulty of identifying transformed tissues in the nongreen embryonic cells used for transformation. On page 910 Khan and Maliga describe a way to overcome this bottleneck. They linked a modified form of GFP to an antibiotic resistance marker, making it easy to identify transformed tissues visually.