| 2026-04-16 | Question from someone seeking reassurance |
| 2026-02-22 | Protein-building acid, informally |
| 2026-02-06 | Kind of acid |
| 2026-01-02 | Kind of acid |
| 2025-11-24 | Kind of acid that is the building block for a protein |
| 2025-07-07 | Kind of acid in proteins |
| 2025-06-15 | ___ acid |
| 2025-03-16 | ___ group (chemistry classification) |
| 2024-10-02 | Kind of acid that forms proteins |
| 2024-06-06 | Kind of acid |
| 2024-03-29 | ___ acid |
| 2024-03-21 | Kind of organic acid |
| 2024-02-15 | Kind of acid |
| 2023-11-25 | Kind of group in chemistry |
| 2023-10-01 | ___ acid |
| 2023-01-26 | Kind of group in chemistry |
| 2022-12-04 | ___ acid |
| 2022-11-02 | Protein-building acid |
| 2022-01-05 | ___ acid |
| 2021-09-23 | Protein-building acid type |
| 2020-10-12 | Protein builder, informally |
| 2020-09-13 | Kind of acid |
| 2020-08-12 | ___ acid |
| 2020-07-22 | Compound containing an NH2 group, informally |
| 2020-07-18 | ___ acid |
| 2019-09-01 | Kind of acid |
| 2019-04-28 | ___ acid |
| 2018-11-05 | ___ acid (protein builder) |
| 2018-10-04 | ___ acid |
| 2018-03-26 | ___ acid (protein component) |
| 2018-01-12 | ___ acid |
| 2017-10-25 | Essential ___ acids |
| 2017-06-04 | ___ group (structure found in proteins) |
| 2016-10-04 | ___ acid (protein builder) |
| 2016-07-25 | Protein acid |
| 2016-04-24 | Acid head? |
| 2015-10-13 | ___ acid |
| 2015-10-01 | ___ acid |
| 2015-08-24 | ___ acid |
| 2015-07-02 | Protein constituent, informally |
| 2015-04-13 | ___ acid |
| 2014-12-18 | Important acid |
| 2014-09-08 | ___ acid (protein building block) |
| 2014-08-12 | Acid in proteins, informally |
| 2014-06-23 | ___ acid (building block of biology) |
| 2014-06-11 | Protein-building acid |
| 2014-05-30 | Monomer of proteins, informally |
| 2013-06-01 | Certain building block, informally |
| 2013-01-15 | ___ acid |
| 2013-01-09 | Essential ___ acid |
| 2012-05-28 | Protein acid, for short |
| 2012-04-17 | ___ acid (protein builder) |
| 2012-03-19 | Protein-building acid |
| 2011-05-26 | Part of PABA |
| 2011-05-21 | Essential acid |
| 2010-10-31 | Kind of acid |
| 2010-05-14 | Acid head? |
| 2008-08-06 | Protein acid |
| 2008-05-11 | Acid in proteins |
| 2008-04-20 | Protein acid, informally |
| 2008-01-29 | ___ acid (protein component) |
| 2007-08-15 | Protein acid, for short |
| 2007-08-09 | Protein building block, for short |
| 2007-05-16 | Part of a chemistry group |
| 2006-01-05 | Kind of group, in chemistry |
| 2004-08-04 | Protein acid |
| 2004-08-03 | ___ acid |
| 2004-02-27 | Kind of group, in chemistry |
| 2003-11-23 | Building block, informally |
| 2003-09-28 | With 94-Across, protein part |
| 2003-01-22 | ___ acid |
| 2002-02-19 | Acid in proteins |
| 2002-02-18 | ___ acid |
| 2002-02-14 | Kind of acid |
| 2001-10-10 | ___ acid |
| 2001-03-19 | Kind of acid |
| 2001-02-13 | ___ acid |
| 2001-01-08 | Kind of acid |
| 2000-10-04 | ___ acid |
| 2000-09-09 | Acid head? |
| 1999-12-30 | Essential acid |
| 1999-10-06 | Acid in proteins |
| 1999-08-24 | Kind of acid |
| 1999-03-15 | Kind of acid |
| 1999-01-26 | Protein building block |
| 1999-01-20 | Acid type |
| 1998-06-22 | Certain acid |
| 1998-05-19 | Kind of acid |
| 1998-04-12 | ___ acid |
| 1997-02-28 | Kind of acid |
| 1996-04-07 | Part of PABA |
| 1996-01-27 | Acid type |
| 1995-12-30 | Relating to NH2 |
| 1995-12-14 | ____ acid |
| 1995-11-28 | Protein acid |
| 1995-11-25 | Acid type |
| 1995-02-07 | Another kind of acid |
| 1994-10-19 | Kind of acid |
| 1994-02-20 | Kind of acid |
| 1994-01-18 | An acid |
| 1994-01-12 | _____ acid |