Modifies a noun

• baby: Selected objects have ranged from a psychiatrists couch and test tube baby to the rocket and a toothbrush.

• study: Another ' disappeared ' category are animals bred and killed so that their body parts can be in test tube studies.

• experiment: Look back at the locust in a test tube experiment.

• research: A modified form of vitamin A has been reported to work synergistically with chemotherapy in test tube research.

• reaction: Enantiomers behave in the same way in ordinary test tube reactions.