Department of Biology, University of Bologna, via Irnerio 42, 40126 Bologna, Italy. piero.fariselli@unibo.it|Department of Biology, University of Bologna, via Irnerio 42, 40126 Bologna, Italy. piero.fariselli@unibo.it|Department of Biology, University of Bologna, via Irnerio 42, 40126 Bologna, Italy. piero.fariselli@unibo.it