Specimen

A specimen is a sampling of a group used for testing to indicate the reaction of a larger whole. It often refers to biological specimens for laboratory testing.

History
Sir Ram referred to Git Hoskins as a specimen. He turned Git into living bandages, intending to use the procedure on others.

Curt Connors used a mouse specimen named Mickey to test the Neogenic Recombinator's ability to regrow lost limbs before trying it on himself.