1. Department of Immunology, University Complutense, The Madrid Regional Blood Center, Madrid, Spain.
2. Department of Hematology, The Madrid Regional Blood Center, Madrid, Spain.
3. Facultad de Química, Departamento de Biología, Universidad Nacional Autónoma de México, Mexico City, Mexico.
4. Department of Molecular Biology, Instituto Nacional de Cardiología Ignacio Chávez. Mexico City, Mexico.
5. Immunogenetics Division, Transplantation Department, Instituto Nacional de Ciencias Médicas y Nutrición Salvador Zubiran, Mexico City, Mexico.