ðiːz θɹˈiː stɹˈeɪnz ɑːɹ kˈæɹɪktɚɹˌaɪzd baɪ ɐ sˈɪŋɡəl mˌɑːnoʊmˈoːɹfɪk vˈɜːʒən ʌvðə dʒˈiːn sˌiːˌeɪtʃˈɑːɹ wˈʌn ˈeɪ, wˌɪtʃ ɪmˈɜːdʒd æɾ ɐpɹˈɑːksɪmətli ðə sˈeɪm tˈaɪm æz ðə θɹˈiː mˈɑːdɚn klˈoʊnz.
These three strains are characterized by a single monomorphic version of the gene Chr1a, which emerged at approximately the same time as the three modern clones.