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For 2),

Can I ask you what kind of registration is used?
For example, if I have a template on Talairach space (Each ROI would has an integer value for labeling) and try to transform this template to MNI space, I assume that this MNI-registered template would not have integer value(maybe it would be floating number) to represent ROIs since we performed registration.

I need MNI-registered template with integer value labeling. Could you recommend a way to do it?