Historical clue formulations

• Classification that anyone can donate to — 2026-01-04
• Like about 4% of human blood — 2024-06-04
• Like universal blood recipients — 2021-03-21
• Alternative to O — 2020-05-21
• Universal recipient's category — 2019-09-03
• Like universal recipients — 2019-07-31
• Like a universal recipient — 2014-06-15
• Category at some banks — 2012-10-25
• Blood designation — 2003-04-11
• Rare blood designation — 2000-07-27