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The Colton (CO) blood group system consists of four antigens, Co a , Co b , Co3, and Co4, located on aquaporin-1 (AQP1), with Co a highly prevalent in all populations (99.8%). The Colton null phenotype, Co(a-b-), is very rare, and individuals with this phenotype lack the high-prevalence antigen Co3. To date, only six Co(a-b-) probands have been reported and four silencing alleles characterized. We identified an AQP1-null allele in a white woman with anti-Co3 caused by deletion of a G atdoi:10.21307/immunohematology-2019-115 fatcat:hjrcaw6twjdazcyb4frhaebr5y