ðɪs ɪz ðɪ ˈoʊnli kˈeɪs ɪnðə mˈɪkst ˈæsɪd fɜːməntˈeɪʃən pˈæθweɪ wˌɛɹ ˌeɪtˌiːpˈiː ɪz nˌɑːt pɹədˈuːst vˈaɪə sˈʌbstɹeɪtlˈɛvəl fˌɑːsfoːɹɪlˈeɪʃən.
This is the only case in the mixed acid fermentation pathway where ATP is not produced via substrate-level phosphorylation.