[1] Univ Roma Tre, Dept Biol, I-00146 Rome, Italy
[2] Univ Roma Tre, Interdept Lab Electron Microscopy, I-00146 Rome, Italy
[3] IRCCS Lazzaro Spallanzani, Natl Inst Infect Dis, I-00149 Rome, Italy
[4] Univ Camerino, Dept Mol Cellular & Anim Biol, I-62032 Camerino, MC, Italy
[5] Univ Roma Tor Vergata, Dept Expt Med & Biochem Sci, I-00133 Rome, Italy
[6] Univ Insubria, Dept Struct & Funct Biol, I-21052 Busto Arsizio, VA, Italy
[7] Univ Insubria, Ctr Neurosci, I-21052 Busto Arsizio, VA, Italy