in contrast , if the cells are allowed to cap through the action of ferritin-avidin conjugates on unfixed cells , the average distance ( 13.0 nm ) of the marker molecules appears even more distant from the membrane on the capped portion of the cell ( uropod ) , whereas those on the head region are positioned in close proximity to the bilayer ( 3.7 nm ) .
C0007634
cells
C1178969
portion