This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Keywords from Image Description:
Guinea pig tumor sizing. An experimental guinea pig being held by technician Only the technician's hands and the animal are visible The technician measures the size of reaction of the animal due to recent injection Topics Animals Type Color Photo Source National Cancer Institute Linda Bartlett Photographer Reuse Restrictions None