IAIA IAiO IBIB IBiO IAIB iOiO
These are the blood types: A, A, B, B, AB, and O, respectively.
Since both A and B are dominant to O, which is recessive, they share the trait when both expressed (type AB).
This is called [B. Codominance.]
I am pretty sure it is something related to space
They mainly target airway epithelial cells
