Divergent functions of two clades of flavodoxin in diatoms mitigate oxidative stress and iron limitation Thalassiosira pseudonana and 4 open-ocean diatoms were subjected to iron limitation or short-term oxidative stress (hydrogen peroxide). mRNA profiles of T. pseudonana (CCMP1335), Thalassiosira oceanica (CCMP1005), Amphora coffeaeformis (CCMP1405), Chaetoceros sp. (CCMP199), and Cylindrotheca closterium (CCMP340). Overall design: mRNA profiles of five diatoms under control conditions, iron limitation, and oxidative stress conditions.