the assay system consisted of the giant internodal cells of an alga , nitellopsis obtusa , which contain well-organized arrays of actin filaments ( actin cables ) running along the cell long axis , and a glass microneedle ( tip diameter , approximately 7 microns ; elastic coefficient , approximately 40 pn/microns ) , which was coated with skeletal muscle myosin at the tip and extended from a micromanipulator at right angles with the actin cables .
C0025979
actin filaments
C0007634
cell