What does the cryptic crossword clue "A protein not naturally used by 16 (8)" mean?

This cryptic clue uses wordplay to arrive at the answer. Visit the page for progressive hints — definition, wordplay type, and a full step-by-step explanation.

A protein not naturally used by 16 (8)

Guardian Cryptic #22695 | 8 Across | 2002-12-05 flower

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