| Answer | Crossword Clue |
|---|---|
| ABO | Classification system for blood |
| ABO | Blood classification system |
| ABO | ... system (blood classification) |
| ABO | Blood-classification system |
| ABO | Human blood classification system |
| ABO | ... system (human-blood classification) |
| ABO | Blood system, for short |
| RHESUS | Animal for which a blood-group system is named |
