Changing blood types.
Varki
A P
AP
D000017:ABO Blood-Group System / Q000378:metabolism*; D000118:Acetylglucosaminidase / Q000378:metabolism*; D002240:Carbohydrate Sequence; D006801:Humans; D008969:Molecular Sequence Data; D013296:Streptococcus pneumoniae / Q000201:enzymology
D000017:ABO Blood-Group System; D000118:Acetylglucosaminidase