It takes two to flirt with a dimeric RNase.

In my long RNase-life-time I have had the fortune to entertain with Lelio Mazzarella what I have called special interactions, which not only advanced my knowledge of proteins but also gave pleasure, as one obtains by reading a beautiful book, an inspiring poem, or watching a very good movie. In this article, I recall the more than 30-year long story of these interactions in which "it took two," a structural biologist with his coworkers and a biochemist with his coworkers, to flirt with an unusual, dimeric RNase.