Dear Michael, the cosmid that you are describing contains part of CBP80 which is accession number AJ238970 not AJ238969. I checked the CBP80 entry (AJ238970) and you are correct that the map data is wrong, it maps to 4C7-8. I'll notify the correction to EMBL. CBP20 maps to 90E1-2. . Best wishes Joe Dr. Joe D. Lewis University of Edinburgh