ddF analysis of the factor XI gene. Autoradiographs of ddF analysis are shown for exons that gave discordant results between the patients and the control individuals designated as normal. (A) exon 5, (B) exon 7, (C) exon 8-9, (D) exon 9-10, and (E) exon 11. The arrows identify the positions of new or shifted bands in the patient samples that indicate the presence of nucleotide changes.