Comment "The" or "A"? (Score 3, Informative) 8
Same sort of thing as when "sequencing the human genome" was a big project. Obviously a major exercise in gene sequencing and a basis for situating subsequent sequencing operations; but once you start talking detail there isn't 'the human genome'; literally everyone has one; and it turns out that different differences matter or don't at radically different levels.
Presumably the methods used to do it once will be helpful in doing it more often in the future; but I'll be curious what we discover about the balance of 'normalcy' vs. some relatively subtle and confusing combination of surprisingly variable ways to have a brainstem that seems to work just fine along with surprisingly subtle, no ghastly big lesions, ways to have one that ends up being totally dodgy.