It is rathe a silly question than a filosofical one!
I have a X gene. And I want to know its expression in the brain.
So, I have two brains (B1 and B2).
B1 is the whole brain.
B2 are parts of the brain for instance frontal lobe, parietal lobe, occipital lobe, and temporal lobe.
If I sum the Xgene expression of B2 would it represent the Xgene expression in B1?