Enter a clue or pattern or both:
The Clue
Like the human genome, before the 1990s (8 letter answer)
The Answer
UNMAPPED
Tags
Notes
The answer UNMAPPED is so rare that it appears less than once every 2500 puzzles.
Definition
UNMAPPED as an adjective:
1. (chartless, uncharted, unmapped) = (of unknown regions) not yet surveyed or investigated; "uncharted seas"