Schematic structures of the dAda2b gene and dADA2b proteins. A: The structure of two alternatively spliced dAda2b messages. Black boxes indicate the position of exons. B: Alignment of dADA2bS and dADA2bL protein sequences. The N-terminal 330 amino acid region is represented by lines and boxes indicating the position of conservative protein motifs. The amino acid sequences of the C-terminal regions from amino acid 331 are aligned. The region corresponding to ADA box 3 in ADA2bL is shown in gray.