Historical clue formulations

• ___ acid — 2026-09-12
• Question from someone seeking reassurance — 2026-04-16
• Protein-building acid, informally — 2026-02-22
• Kind of acid — 2026-02-06
• Kind of acid — 2026-01-02
• Kind of acid that is the building block for a protein — 2025-11-24
• Kind of acid in proteins — 2025-07-07
• ___ acid — 2025-06-15
• ___ group (chemistry classification) — 2025-03-16
• Kind of acid that forms proteins — 2024-10-02
• Kind of acid — 2024-06-06
• ___ acid — 2024-03-29
• Kind of acid — 2024-02-15
• Kind of group in chemistry — 2023-11-25
• ___ acid — 2022-12-04
• ___ acid — 2022-01-05
• Protein-building acid type — 2021-09-23
• Protein builder, informally — 2020-10-12
• Kind of acid — 2020-09-13
• ___ acid — 2020-08-12
• Compound containing an NH2 group, informally — 2020-07-22
• ___ acid — 2020-07-18
• Kind of acid — 2019-09-01
• ___ acid — 2019-04-28
• ___ acid (protein builder) — 2018-11-05
• ___ acid — 2018-10-04
• ___ acid (protein component) — 2018-03-26
• ___ acid — 2018-01-12
• Essential ___ acids — 2017-10-25
• ___ group (structure found in proteins) — 2017-06-04
• ___ acid (protein builder) — 2016-10-04
• Protein acid — 2016-07-25
• Acid head? — 2016-04-24
• ___ acid — 2015-08-24
• Protein constituent, informally — 2015-07-02
• ___ acid — 2015-04-13
• Important acid — 2014-12-18
• ___ acid (protein building block) — 2014-09-08
• Acid in proteins, informally — 2014-08-12
• ___ acid (building block of biology) — 2014-06-23
• Protein-building acid — 2014-06-11
• Monomer of proteins, informally — 2014-05-30
• Certain building block, informally — 2013-06-01
• ___ acid — 2013-01-15
• Essential ___ acid — 2013-01-09
• Protein acid, for short — 2012-05-28
• ___ acid (protein builder) — 2012-04-17
• Protein-building acid — 2012-03-19
• Part of PABA — 2011-05-26
• Essential acid — 2011-05-21