[1] UNIV CALIF SAN DIEGO, DEPT BIOL, 9500 GILMAN DR, LA JOLLA, CA 92093 USA
[2] UNIV CALIF SAN DIEGO, CTR MOLEC GENET, LA JOLLA, CA 92093 USA
[3] UNIV VALENCIA, FAC BIOL, DEPT GENET, VALENCIA, SPAIN
[4] UNIV VALENCIA, FAC BIOL, SERV BIOINFORMAT, VALENCIA, SPAIN
[5] UNIV AUTONOMA MADRID, CSIC, CTR BIOL MOLEC SEVERO OCHOA, E-28049 MADRID, SPAIN