ðə sˈɪɡnəlɪŋ mˈɑːlɪkjˌuːlz ɡˈaɪdɪŋ ðə ɡɹˈoʊθ ænd pɹədʒˈɛkʃənz ʌv kəmˈɪʃɚɹəl nˈʊɹɹɑːnz hæv wˈɛl stˈʌdid hˈɑːməlˌɑːɡz ɪn ɪnvˈɜːɾɪbɹˌeɪts.
The signaling molecules guiding the growth and projections of commissural neurons have well studied homologs in invertebrates.