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The ABO blood group - Blood Groups and Red Cell Antigens - NCBI Bookshelf
Blood Types and Punnett Squares
ABO Blood Group System (AB0 Blood types & compatibility explained
The importance of knowing your baby's blood type
How to Determine Your Baby's Blood Type Using a Punnett Square
Blood types, Type A, B, AB & O
ABO Blood groups and Pedigree
Blood Types and Punnett Squares
Multiple Alleles