ðə nˌʊɹɹətɹˈoʊfɪnz ðæt ˈæktᵻvˌeɪt tˌiːˌɑːɹkˈeɪ bˈiː ɑːɹ: bˌiːdˌiːˌɛnˈɛf bɹˈeɪn dᵻɹˈaɪvd nˌʊɹɹətɹˈoʊfɪk fˈæktɚ, nˌʊɹɹətɹˈoʊfɪn fˈoːɹ ˌɛntˈiː fˈoːɹ, ænd nˌʊɹɹətɹˈoʊfɪn θɹˈiː ˌɛntˈiː θɹˈiː.
The neurotrophins that activate TrkB are: BDNF (Brain Derived Neurotrophic Factor), neurotrophin-4 (NT-4), and neurotrophin-3 (NT-3).