[1] UCL, Inst Phys Living Syst, Dept Phys & Astron, London WC1E 6BT, England
[2] UCL, MRC Lab Mol Cell Biol, London WC1E 6BT, England
[3] Univ Fed Rio Grande do Sul, Inst Fis, Caixa Postal 15051, BR-91501970 Porto Alegre, RS, Brazil
[4] Univ Paris Saclay, CNRS, LPTMS, F-91405 Orsay, France