Day 214 (9q34.11-9q34.3): the ABO blood type locus


“Blood Type” by Lizette Chirimme (from South Africa), displayed as part of Nando’s Art Collection at the 1:54 Art Fair in London. Photo: Carol Dixon

Day 214 has 158 protein-coding genes (browser view) including ABO (ABO, alpha 1-3-N-acetylgalactosaminyltransferase and alpha 1-3-galactosyltransferase).

ABO is the gene that determines your main blood type – there are three main alleles for the gene (A, B, and O). The ABO system was discovered in 1900, but the sequence differences between the three alleles weren’t worked out until 1990.

There is no evidence that blood types influence nutrition or personality.

Click here to see all 8649670 letters of Day 214 with ABO underlined (the reference genome has the O allele).

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