the overall dimensions observed in these images are 5.6 x 3.3 x 4.5 nm , and the molecule itself appears distinctly bilobed with the two lobes separated by a cleft . actin monomers in the sheets are arranged with p2 symmetry and are therefore packed in a manner different from that of the molecules in actin filaments .
C0001271
actin
C0025979
actin