21. These findings demonstrate that LepA is significant for bacteria, mitochondria, and plastids . 22. Today the plastid is no longer capable of photosynthesizing and its function is a mystery. 23. These chloroplasts are known as secondary plastids . 24. As a result, plastids must make their own functional RNAs or import nuclear counterparts. 25. The ancestral alveolate probably possessed a plastid . 26. The cytoplasm definition of Strasburger excluded the plastids ( " Chromatoplasm " ). 27. The plastids are maintained within the host, temporarily continuing photosynthesis and benefiting the predator. 28. There have been a number of discoveries of PPR proteins in both plastids and mitochondria. 29. This supports the endosymbiotic theory and indicates an evolution of plastid division in land plants. 30. Plastids have their own DNA and are developed from endosymbionts, in this case cyanobacteria.