Deletion of three introns (introns 3, 4 and 5), about 15kb 3' to the start of transcription: region replaced with a cDNA extending from an ApoI site in exon 3 to a BanII site in exon 6.
ifminigene rescues if13ts
ifminigene rescues if17
ifminigene rescues if21
ifminigene rescues if35
ifminigene rescues ifSEF
ifminigene rescues ifB4
ifminigene partially rescues if2B1
ifminigene partially rescues ifC2B
ifminigene partially rescues ifB4
ifminigene fails to rescue T(1;4)ifV2