He says he's also not sure about the tissue matches.

No positive identifications - through scars, tattoos or tissue matches - have been made.

There was a close tissue match just a few months ago.

One advantage of using cord blood instead of bone marrow is that the tissue match need not be quite as exact.

It was a good tissue match, surprisingly good in view of the wide difference between donor and recipient.

But now that Glapion's involved and more people are readily accessible to us for tissue matches, it seems we could gear up production.

In both cases, the key to success is having the closest possible blood and tissue matches.

The real problem is finding a tissue match for Dallas.

We go for the closest possible tissue match, then damp down the immune response.

The tissue match with your boy is satisfactory.