when these cells were incubated with polycationic ferritin ( 0.5 mg/ml ) , ferritin particles , representative of anionic sites , were spread widely on their surfaces at 4 degrees c , while they formed clusters at 37 degrees c , especially on filopodial surface areas opposing adjacent projections in sv40-3t3 cells .
C0007634
cells
C0600315
filopodial