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Paradoxical heterozygous expression of AP3B1 from homozygous dogs and homozygous expression of AP3B1 from heterozygous dogs. cDNA sequence of the AP3B1 exon 21 A tract is shown. An arrow denotes the start of sequence heterogeneity caused by the presence of both 9A and 10A-containing transcripts in the cDNA population of the affected.
