If you really needed to take out a lot of tissue, the cancer had, in all probability, already spread through the system.

如果你真的需要取出很多组织，癌症很可能已经蔓延到了整个系统。

youdao

If you have diabetes or have arthritis, you've already been dealing with autoimmune diseases that arise when the body's own immune system mistakenly attacks and destroys healthy body tissue.

如果你患有糖尿病或者关节炎，你自身的免疫系统会错误地攻击并破坏健康的机体组织时，这就引起了自身免疫疾病。

youdao

This tissue will become the central nervous system.

这一组织将来会成为中枢神经系统。

youdao

She says the chimpanzee tissue showed a severe loss of immune system cells.

VOA: special.2009.09.08

Again, in the context of a specific tissue site, in this case it's the nervous system.

当然又是放在某种组织当中来说,这次是在神经系统

耶鲁公开课 - 生物医学工程探索课程节选

This approach has the advantage that the tissue has a functioning system of blood vessels to deliver nutrients, so it should be possible to grow tissue cultures more than a millimetre thick the current limit.

ECONOMIST: Monitor

Could patients have themselves cloned in order to harvest cells from a genetically-identical embryo, gaining a donor and avoiding the major problem of transplant surgery: rejection of foreign tissue by the immune system?

CNN: GROWN TO ORDER

"This is a stem cell that is generated by the body's own tissue so the immune system does not recognise it and they can get any place they want without being attacked, " said Prof Rambukkana.

BBC: Leprosy bacteria use 'biological alchemy'