Discrete regions of the ABCA17P gene show near perfect sequence identity with corresponding segments of the ABCA3 gene. This is exemplified for ABCA17P exon 15 (+ partial intron 15) and ABCA3 exon 31 (+ partial intron 31), respectively. Bold capital letters represent exon and small letters intron sequences. Red shaded nucleotides indicate known mutation sites in the ABCA3 gene in individuals with neonatal surfactant deficiency. Yellow shaded letters denote non-identical nucleotides.