ˈeɪ "tˈaɪɹəsˌaɪn kˈɪneɪs" ɪz ɐn ˈɛnzaɪm wˌɪtʃ ɪz kˈeɪpəbəl ʌv ˈædɪŋ ɐ fˈɑːsfeɪt ɡɹˈuːp tə sˈɜːʔn̩ tˈaɪɹəsˌaɪnz ˌɔn tˈɑːɹɡɪt pɹˈoʊtiːnz, ɔːɹ "sˈʌbstɹeɪts".
A "tyrosine kinase" is an enzyme which is capable of adding a phosphate group to certain tyrosines on target proteins, or "substrates".