Rubidium transport in the cyanobacterium Synechococcus R-2 (Anacystis nidulans, S. leopoliensis) PCC 7942 Ritchie, R.J. Plant Cell and Environment 20(7): 907-918 1997 0140-7791 10.1046/j.1365-3040.1997.d01-127.x https://eurekamag.com/research/009/373/009373558.php