Can someone please explain the differences in protein domains

[JCH2500]

AAMC Bio/biochem Section Bank Q#63 asks which protein domain of STAT3 is NOT predicted to play a role in it's signaling?
A. Nuclear localization domain
B. Signal sequence domain
C. DNA binding domain
D. Protein binding domain

The correct answer is B, but I unfortunately can't recall the functions of the other domains. Can someone please explain the differences between them? Thank you!

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[JustinM88]

AAMC Bio/biochem Section Bank Q#63 asks which protein domain of STAT3 is NOT predicted to play a role in it's signaling?
A. Nuclear localization domain
B. Signal sequence domain
C. DNA binding domain
D. Protein binding domain

The correct answer is B, but I unfortunately can't recall the functions of the other domains. Can someone please explain the differences between them? Thank you!

I can help w/ these 2:
Nuclear localization domain - the domain of a protein that causes said protein to go to the nucleus.
DNA binding domain - the domain of a protein that binds said protein to DNA.

 

[JCH2500]

I can help w/ these 2:
Nuclear localization domain - the domain of a protein that causes said protein to go to the nucleus.
DNA binding domain - the domain of a protein that binds said protein to DNA.

Thank you!
Signal sequence domain are protein domains required for proteins that are directed to secretory pathways