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Related Clues:
- __ acid (protein building block)
- __ acid
- With 71-Down, protein building block
- Kind of acid found in protein
- Of element 5
- Part of a chemistry group
- Nitrogen/hydrogen radical
- Kind of acid in protein
- Kind of acid synthesized to produce aspartame
- Protein building block, for short
- __ acids (protein building block)
- Protein acid, for short
- Another 46-Across
- Alpha-___ acid
- ___ acid (protein component)