This paper contains seemingly paradoxical results from a physiological point of view, which is why I find it impressive.
This posting might remind you of “Impressive paper in biology: part 1“, one of my previous postings.
I wish this paper were readily available. (the authors suggested the existence of gas molecule derived from vascular endothelium, which has later turned out to be NO.)
See also “Addendum primum” of Impressive paper in biology: part 1“.
Furchgott/Zawadzki paper is now downloadable.