This is the info we have concerning the maping of the two inserts and the deficiency: Df(1) 23437.- Inserted at -100 bp from the ATG site in TnI. Deleted about 2 Kb based on Southern blots PL87.- Inserted at -30 bp from the ATG site in TnI PG31.- Inserted at -249 bp from the ATG site in TnI