1. Istituto di Cristallografia; CNR, Trieste Outstation; Italy
2. Istituto di Biochimica e Biochimica Clinica; Università Cattolica del Sacro Cuore; Roma Italy
3. Istituto di Chimica del Riconoscimento Molecolare; CNR c/o Università Cattolica del Sacro Cuore; Roma Italy
4. School of Biochemistry; University of Bristol; UK
5. Shubnikov Institute of Crystallography of Federal Scientific Research Centre; “Crystallography and Photonics” of Russian Academy of Sciences; Moscow Russia
6. National Research Centre “Kurchatov Institute”; Moscow Russia