Sequence analysis of the exon 4/intron 4 and intron 10/exon 11 regions of the p67-phox gene amplified by PCR using genomic DNA from patient IP and a normal control. The exonic sequences are represented by capital letters, while the intronic sequences are indicated by lower case letters. Arrows indicate transitions of g → a at position +1 of intron 4 and of a → g at position −21 of the branch point sequence of intron 10. The 5′ end of the DNA is at the top of each sequencing panel.