At least they were kind enough to give me some tissue samples.

But the science of the time could do nothing with the tissue samples.

We need a few tissue samples, at least to start with.

It is common to take about three to five tissue samples.

"We are not going to take any more tissue samples."

"Do you think you'll learn anything from the tissue samples?"

But the man who left the tissue sample doesn't quite fit the crime.

"When the first tissue sample was taken, she told me not to hold my breath."

A tissue sample is taken and sent to a lab.

Surgeons took a tissue sample to test for cancer, but the results are not expected until next week.