Institute of Structural and Molecular Biology, University College London, UK. jmgonzalez@cnio.es|Institute of Structural and Molecular Biology, University College London, UK. jmgonzalez@cnio.es|Institute of Structural and Molecular Biology, University College London, UK. jmgonzalez@cnio.es|Institute of Structural and Molecular Biology, University College London, UK. jmgonzalez@cnio.es|Institute of Structural and Molecular Biology, University College London, UK. jmgonzalez@cnio.es|Institute of Structural and Molecular Biology, University College London, UK. jmgonzalez@cnio.es|Institute of Structural and Molecular Biology, University College London, UK. jmgonzalez@cnio.es|Institute of Structural and Molecular Biology, University College London, UK. jmgonzalez@cnio.es