570 aufsatzsammlung celbiologie cellcommunication cellinteraction celljunctions cellmembranes cells cellules connexines connexins gapjunction gapjunctions gapjunctions(cellbiology) interactie interaction intercellularjunctions jonctionscommunicantes jonctionscommunicantes(biologiecellulaire) permeability physiology plasmodesmen qu350 we2200 we5000 zellkontakt ziekten