You’ve discovered a new cytoskeletal polymer which resembles actin in an archaean; you call the subunit for this polymer AALP (for archaea actin-like protein). AALP binds to ATP and can catalyze the hydrolysis of ATP to ADP. As with actin, this hydrolysis happens more quickly when AALP is in a filament and most of free AALP is bound to ATP. You measure the rate of the AALP filament growth in vitro at plus (more quickly growing) end and at minus (more gradually growing) end and obtain the graph diagrammed in figure