The HuGeMap database stores the major genetic and physical maps of the human genome. It is also interconnected with the gene radiation hybrid mapping database RHdb. HuGeMap is accessible through a Web server for interactive browsing at URL http://www.infobiogen.fr/services/Hugemap , as well as through a CORBA server for effective programming. HuGeMap is intended as an attempt to build open, interconnected databases, that is databases that distribute their objects worldwide in compliance with a recognized standard of distribution. Maps can be displayed and compared with a java applet (http://babbage.infobiogen.fr:15000/Mappet/Show.html ) that queries the HuGeMap ORB server as well as the RHdb ORB server at the EBI. CONTENTS OF THE DATABASE The HuGeMap database The HuGeMap database includes (i) the genetic maps from Généthon (1) and the Cooperative Human Linkage Consortium (2), (ii) the physical maps from CEPH-Généthon (3–5) and from the Whitehead Institute, MIT (6). It also conta...