1.   In a series of experiments, the Boston researchers implanted human breast cancer cells in a strain of mice in which breast cancers grow easily.

2.   In a follow-up study, the researchers implanted tags in the cod that produced coded acoustic signals.

3.   Other researchers are implanting a form of electronic pacemaker in human brains to help treat epilepsy.

4.   The Johns Hopkins researchers also implanted gliomas in the flanks of rats to measure directly the size of the tumors before and after treatment with various compounds.

5.   The researchers have implanted the engineered liver tissues into mice to see if the endothelial cells can form capillaries.

6.   To that end, the researchers have implanted an experimental array in one of their monkeys that is rigged to move an animated arm on a computer screen.

7.   Researchers have already implanted some of these pig organs into baboons with modest success.

8.   The researchers implanted transmitters in sharks to track their movements.