əpˌɑːn ˈɛntɚɹɪŋ, θɹuː ɐ mˈɛkənˌɪzəm nˌɑːt jˈɛt fˈʊli ˌʌndɚstˈʊd, ɹˈoʊboʊ θɹˈiː bɪkˌʌmz dˈaʊnɹɪɡjˌʊleɪɾᵻd ænd ðɪs lˈɪbɚɹˌeɪts ænd ˈʌpɹɪɡjˌʊleɪts ɹˈoʊboʊ wˈʌn slˈæʃ tˈuː, ɪfˈɛktɪvli ɹᵻpˈɛlɪŋ ðə nˈʊɹɹɑːn fɹʌmðə flˈoːɹ plˈeɪt mˈɪdlaɪn.
Upon entering, through a mechanism not yet fully understood, Robo-3 becomes downregulated and this liberates and upregulates Robo-1/2, effectively repelling the neuron from the floor plate midline.