[rubidium]

And the authors of the article acknowledge as much in the intro paragraph with multiple references, what's your point?

I like the authors opening point "Therefore, an important challenge for the growing field of quantum effects in biomolecules is to clearly identify which quantum features with no classical counterpart may manifest in these systems and how they may influence the process of interest."

What's going to be really fun to find is biological systems which naturally exploit efficient quantum processes (tunneling, coherence, or otherwise) to help cells do their thing. This is a nice step on that road.