fɹʌm ɐ stˈʌdi ʌv hɪstˈɔːɹɪkəl sˈæmpəlz, ðə fˈoːɹ stɹˈeɪnz ɔːɹ fˈɔːɹmz ɑːɹ nˌɑːt dˌaɪəɡnˈoʊzəbəl baɪ ðɛɹ mˌaɪɾəkˈɑːndɹɪəl dˌiːˌɛnˈeɪ sˈiːkwənsᵻz.
From a study of historical samples, the four strains or forms are not diagnosable by their mitochondrial DNA sequences.