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% replaces any number of letters (la% - lake, lamp)_ replaces one letter (ca_ - car, cat)

Crossword clues for Test-tube 7 letters:

INVITRO: Test-tube
INVITRO: How "test-tube babies" are fertilized
SERA: Test-tube substances
GUINEAPIGEON: Test-tube turbit?
CCS: Test-tube measures
LAB: Room with test-tube racks