| Answer | Crossword Clue |
|---|---|
| radicals | RADICAL, a group of atoms that act as a unit in chemical compounds |
| radical | a group of atoms that act as a unit in chemical compounds |
| radicals | A group of atoms behaving as a unit in a number of compounds |
| neuropeptide | Any of a group of compounds that act as neurotransmitters and are short-chain polypeptides |
| neuropeptides | Any of a group of compounds that act as neurotransmitters and are short-chain polypeptides |
