Christine Gaspin and Thomas Schiex
from the INRA of Toulouse
for their encouragements, the very good advices they gave me
and, finally, for the patience with which they answered to my
numerous messages (some of which were very long :) );
Joël Pothier and Alain Viari from
the Atelier de BioInformatique at Paris for
their advices.
Marie-France Sagot
