Fill in Each of the Blanks with the Best Word

Short Answer

Fill in each of the blanks with the best word or phrase selected from the list below. Not all words or phrases will be used; each word or phrase should be used only once.
The axon growth cone contains two prominent actin structures: _____________ are composed of bundled F-actin, whereas _____________ are a meshwork of branched F-actin. Many axon guidance cues affect the actin cytoskeleton through their receptors and downstream effectors such as the _____________ Rho, Rac, and Cdc42. These molecules are activated by _____________ and inactivated by _____________. For example, in the context of ephrin-A to EphA _____________ signaling, a GEF called ephexin was shown to mediate growth cone _____________ by linking the EphA receptor to RhoA.
collapse guanine nucleotide exchange factors (GEFs)
filopodia lamellipodia
forward reverse
G-protein-coupled receptors (GPCRs) small GTPases
GTPase activating proteins (GAPs) stabilization