ˈiːlˌɑːŋɡeɪɾɪŋ ðɪ ˈæktɪn fˈɪləmənt əkˈɜːz wɛn fɹˈiːˈæktɪn dʒˈiːˈæktɪn bˈaʊnd tʊ ˌeɪtˌiːpˈiː ɐsˈoʊsɪˌeɪts wɪððə fˈɪləmənt.
Elongating the actin filament occurs when free-actin (G-actin) bound to ATP associates with the filament.