CD carried out the molecular biology experiments, participated in the sequence alignment and drafted the manuscript.
ML, carried out the molecular biologic experiments, participated in data analysis and manuscript writing.
EJB conducted the protein biochemistry studies and molecular biology experiments, participated in the statistical analysis and drafted the manuscript.
RdeM conceived of the study, carried out the molecular genetic experiments, participated in the sequence alignment and drafted the manuscript.
NS conceived of the study, performed molecular biology experiments, participated in and coordinated the data analysis, drafted and revised the manuscript.
MJF designed and performed all the molecular genetic experiments, participated in the interpretation of the results and in the writing of the manuscript.
GCW carried out molecular and genetic experiments, participated in the design and coordination of the study, analyzed the data, and drafted the manuscript.
HK performed most molecular experiments and participated in manuscript preparation.
AC conceived of the molecular experiments and participated in their design and interpretation.
