1. UPR9073 du CNRS, Institut de Biologie Physico‐Chimique, 13 rue Pierre et Marie Curie, Paris 75005, France.
2. Department of Cell and Molecular Biology, BMC, Box 596, S‐75124 Uppsala, Sweden.
3. Engelhardt Institute of Molecular Biology, Russian Academy of Sciences, 32 Vavilova, Moscow 119991, Russia.