{{Rsnum
|rsid=56392308
|geno1=(-;-)
|geno2=(-;C)
|geno3=(C;C)
|Chromosome=9
|Orientation=minus
|Gene=ABO
|position=133255670
|Gene_s=ABO
|Assembly=GRCh38
|GenomeBuild=38.1
|dbSNPBuild=141
}}[[rs56392308]] is a SNP for the A2 [[ABO blood group]] according to the List of targets and recommended controls for prediction of certain RBC antigens in the Consortium for Blood Group Genes (CBGG): 2009 report.