1. Cardiovascular Development Program, Centro Nacional de Investigaciones Cardiovasculares, CNIC, Madrid, Spain.
2. Pluripotent Cell Technology Unit, Centro Nacional de Investigaciones Cardiovasculares, CNIC, Madrid, Spain.
3. Cellomics Unit, Centro Nacional de Investigaciones Cardiovasculares, CNIC, Madrid, Spain.
4. Bioinformatics Unit, Centro Nacional de Investigaciones Cardiovasculares, CNIC, Madrid, Spain.
5. Cancer and Developmental Biology Laboratory, National Cancer Institute, Frederick, MD 21702, USA.