A research team has studied how the protein transport system of bacteria developed over time to form the system in the chloroplasts of higher plants. They explored the so-called signal recognition particles and their receptors. Bioinformatic and biochemical analysis revealed that the moss Physcomitrella patens has evolutionarily old and new components of the SRP system, and thus represents an intermediate stage in the development from the bacterial transport system to the chloroplast system in higher plants.
Source: FULL ARTICLE at Phys.org