ɐn ɔːltˈɜːnətˌɪv vjˈuː pɹəpˈoʊzᵻz ðæt nˈʊɹɹəl tˈuːb flˈoːɹ plˈeɪt sˈɛlz stˈɛm fɹʌm pɹɪkˈɜːsɚ sˈɛlz wˌɪtʃ mˈaɪɡɹeɪt dᵻɹˈɛktli fɹʌm ˈæksɪəl mˈɛsoʊdˌɜːm.
An alternative view proposes that neural tube floor plate cells stem from precursor cells which migrate directly from axial mesoderm.