A test tube was a narrow container used to hold liquids and cells.
In 2153, while confined to the decontamination chamber with T'Pol, Doctor Phlox was looking at test tubes just as she woke up. (ENT: "Bounty")
In 2268, there was a rack of test tubes in the science laboratory on Earth Two. (TOS: "Miri")
In 2367, Dr. Beverly Crusher retorted to a skeptical William T. Riker that she didn't conjure up a missing Dalen Quaice from a test tube. (TNG: "Remember Me")
In 2367, Captain Jean-Luc Picard suggested that their concern about the growth of Dr. Crusher's Diomedian scarlet moss might be nothing but a "tempest in a test tube." (TNG: "Clues")
In 2369, Worf explained to Kahless's clone that he was not woken up but rather grown in a test tube like a fungus. (TNG: "Rightful Heir")
In 2375, Dr. Julian Bashir was working with test tubes. (DS9: "Tacking Into the Wind")
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