Given scientific fact as input, generate the question from this fact such that it can be answered from the input.
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Question: Most protein antigens require signals from helper t cells (th2) to proceed to make antibody.

Answer: Most protein antigens require signals from helper t cells (th2) to proceed to make what?


Question: Like mitochondria, plastids contain their own dna.

Answer: Like mitochondria, plastids contain their own what?


Question: Hemodialysis has a patient’s blood pass through a length of tubing that travels through an artificial kidney machine.

Answer:
Which form of dialysis has a patient’s blood pass through a length of tubing that travels through an artificial kidney machine?