DNA sequence comprizing 48 bp of the exon 17/intron 17 border inKIT1 and KIT2 associated with the I, I^p, and i alleles. The position of the exon/intron border is marked with a vertical line, the splice mutation (nt1^G → A) with a vertical arrow, and sequence identity to the master sequence with a dash. KIT1 and KIT2sequences from the I allele were obtained by sequencing PCR products from genomic λ clones representing the two forms while direct sequencing of PCR products from genomic DNA was carried out to determine KIT sequences associated with I^p and i.