Key Terms

actin 777

actin cross-linking proteins 793

Arp2/3 complex 786

CapZ protein 785

Cdc42 protein 814

cell migration 811

cell polarity 776

chemotaxis 816

cofilin 784

contractile bundles 807

critical concentration (C_c) 782

cytoskeleton 777

duty ratio 802

F-actin 779

filopodia 778

formin 786

G-actin 779

intermediate filaments 777

lamellipodium 778

leading edge 778

microfilaments 777

microtubules 777

microvilli 775

motor protein 777

myosin 796

myosin light-chain kinase 808

nucleation promoting factor (NPF) 787

power stroke 800

profilin 784

Rac protein 814

Rho protein 814

step size 800

stress fibers 778

thick filaments 804

thin filaments 804

thymosin β₄ 785

treadmilling 784

tropomodulin 785

tropomyosin 806

WASp 788