Phytoplankton including Prochlorococcus, Synechococcus, and  
  pico-photosynthetic eukaryotes (PEuks) 
 PI: Zackary Johnson (Duke University) 
 Version History: 
   Dataset updated: 10 Sept 2014 (current version) 
   Dataset updated: 14 May 2014 
   Dataset updated: 28 May 2013 
   Original data:   25 March 2013