dᵻɹˈɛktᵻd kɹˈɔːlɪŋ mˈoʊʃən ʌv sˈɛlz sˈʌtʃ ɐz mˈækɹəfɪdʒᵻz ɹᵻlˈaɪz ˌɔn dᵻɹˈɛktᵻd ɡɹˈoʊθ ʌv ˈæktɪn fˈɪləmənts æt ðə sˈɛl fɹˈʌnt lˈiːdɪŋ ˈɛdʒ.
Directed crawling motion of cells such as macrophages relies on directed growth of actin filaments at the cell front (leading edge).