ðɪ ɪmpˈoːɹtəns ʌv sˈʌbstɹeɪt vˌɛɹɪəbˈɪlᵻɾi tʊ ˈɛnzaɪm pˈɑːlɪmˌoːɹfɪzəm, nˈaɪntiːnhˈʌndɹɪd sˈɛvənti θɹˈiː, nˈeɪtʃɚ nˈuː baɪˈɑːlədʒi tˈuːhˈʌndɹɪd fˈoːɹɾi θɹˈiː: wˈʌn fˈɪfti wˈʌn dˈæʃ wˈʌnhˈʌndɹɪd fˈɪfti θɹˈiː
The importance of substrate variability to enzyme polymorphism, 1973, Nature New Biology 243: 1 51-153