experimental group

(in an experiment or clinical trial) a group of subjects who are exposed to the variable under study: a lower infection rate in the experimental group that received the vaccine.
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Medical Dictionary

experimental group ex·per·i·men·tal group (ĭk-spěr'ə-měn'tl)
A group of subjects that are exposed to the variable of a control experiment.

The American Heritage® Stedman's Medical Dictionary
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