Angel P Diz1, Juan J Calvete2. 1. Department of Biochemistry, Genetics and Immunology, Faculty of Biology, University of Vigo, Vigo, Spain. Electronic address: angel.p.diz@uvigo.es. 2. Instituto de Biomedicina de Valencia, CSIC, Valencia, (Spain). Electronic address: jcalvete@ibv.csic.es.