cells in optimal ( 5 x 10 ( -9 ) m ) but uniform concentrations of n-formyl-methionyl-leucyl-phenylalanine ( fmlp ) polarized well and showed a 'persistent random walk ' type of locomotion , whereas in supraoptimal concentrations ( 10 ( -7 ) m ) , the cells took erratic paths and polarized poorly , suggesting that monocytes can not develop an anteroposterior polarity if hit by ligand molecules at many points on the cell surface simultaneously .
C0007634
cells
C0699040
cell surface