The number of structure papers, and by inference, the number of papers which would have some crystallization information associated with them, was estimated by using the search tools on the webpage for each journal, looking for all of the key words ‘crystal’, ‘structure’, ‘crystallization’ and ‘protein’ simultaneously, and limiting the search to articles published in the year 2012. The Cell family of journals includes Cancer Cell, Cell Host and Microbe, Cell Metabolism, Cell Stem Cell, Current Biology, Developmental Cell, Immunity, Molecular Cell and Neuron.