As do post-mortem observations ...

[yamyam]

Hello, teachers.

Would you read the following passage?

Physicians do know that they declare a death --- according to strict clinical criteria, the principles of which are outlined in the original report of the president's commission --- that the person is to all intents and purposes dead. But what if, as is sometimes the case, blood chemistry suggests that the pituitary gland at the base of the brain is still functioning? That activity has nothing to do with a person being alive in any meaningful sense. But it undermines a claim that all functions of the entire brain have ceased. As do post-mortem observations that relatively large areas of tissue can be metabolically active in different brain areas at the time death is declared.

I don't understand very much the meaning of the sentence "As do post-mortem observations that relatively large areas of tissue can be metabolically active in different brain areas at the time death is declared". Would you explain it to me?
If possible, would you let me know the sentence structure, too?

Thank you very much in advance for your help!

yam.

[5jj]

I work in TEFL, as do my offspring
= I work in TEFL, and so do my offspring.
= I work in TEFL, and my offspring work in TEFL, too.

It undermines a claim [...] as do post-mortem observations (also undermine the claim) that ...

[yamyam]

Thank you very much for the reply, fivejedjon!
Now I see what the sentence wants to say.

Thanks again,

yam.